Welcome to the Sidereus Watches Online Store. Here you'll find links to a selection of Ready-to-Wear watches, Payment Cards and Limited Edition Watches that are made-to-order.


British Watchmakers' Day

British Watchmakers' Day 2025 Special Edition.

Gordon Bennett, our special edition timepiece for British Watchmakers' Day 2025, features a lustrous British Racing Green dial.

British Racing Green holds a unique place in the annals of motorsport history, with its roots in the 1903 Gordon Bennett Cup, a landmark event held on Irish soil. This came about because in the early 1900's public road racing was prohibited in England. In a gesture of respect to its Irish hosts, Britain's Napier team chose a rich shamrock green for their racing cars, forgaing an Irish connection to this much loved, archetypal British colour.

This special edition piece is limited to just five examples. The deep lustrous dial captures the timeless elegance of British Racing Green, and evokes a modern aesthetic that's both distinctive and understated. Available to pre-order from 10.00am on Saturday the 8th March 2025.

"We've designed this special edition to celebrate the historical link between Britain and Ireland and the legacy of this much-loved hue that continues to find favour with both automotive and horological enthusiasts. This historical link mirrors the spirit of collaboration and shared tradition that unites members of the Alliance from across the British Isles." Bryan Leech, Co-founder of Sidereus Watches.


British Watchmakers' Day 2024 Reserve Edition.

Cosmic Quartet featured four meticulously crafted Reserve Edition watches, each bearing a distinct dial and case combinations reflective of our earth, our moon and more remote celestial elements.

Inspired by over 5,000 years of Irish horological heritage, the foursome pays homage to our own planet, and celestial bodies that have guided humanity's understanding of time and other heavenly bodies that continue to intrigue modern day astronomers.




Reserve Edition 09/50
Blue Planet
Blue Planet
€3 100
Blue Planet
Reserve Edition, only one available. Ex VAT/Taxes (For UK and EU countries VAT is added at Checkout).
Sold Out
Amber Nebula
Amber Nebula
€3 100
Amber Nebula
Only one available. Ex VAT/Taxes (For UK and EU countries VAT is added at Checkout).
Reserve Edition 09/50
Dark Star
Dark Star
€3 100
Dark Star
Only one available. Ex VAT/Taxes (For UK and EU countries VAT is added at Checkout).

Sidus Collection

Sidus Collection.

Discover the next generation of watches from Sidereus.

Since the dawn of time, mankind has looked to the heavens to measure the passage of time. The movement of celestial bodies formed the foundation of horology, shaping our understanding of time itself.

The Sidus Collection is an evolution of our existing values. Sidus models remain true to many of the design elements first established in our Newgrange timepieces.

Sidus is our first watch to offer a GMT function. However, unlike most GMT watches, an under-dial disc is employed to display the second time zone. Furthermore, the GMT disc features a dual-coloured background that transitions from dark to light between dawn and dusk, providing an instantaneous reference to day and night time in the second time zone.

The dial is a bi-metallic construction, a brass base is fused with an anodised aluminium top layer that pleasingly catches the light across a series of concentric conical surfaces.

Sidus GMT watches are available in three dial colours and five case finishes.

Prêt-à-Porter Watches

British Watch Day 2025

10% Off all Prêt-à-Porter watches at British Watchmakers' Day on the 8th March 2025 and online until the 31st March 2025. Prices shown are exclusive of VAT. Vat and 10% discount added at checkout.

Below you'll find a selection of prêt-à-porter watches that are built, regulated and tested and ready to wear.

All prêt-à-porter watches are available for dispatch to Ireland, the UK and EU countries. For UK and EU sales please allow seven business days for processing of export documentation prior to dispatch.

Prêt-à-Porter
Newgrange Date/Time with a Polished Finish and a Quartzite White Dial 50/50
Newgrange Date/Time with a Polished Finish and a Quartzite White Dial 50/50
€2 115
Newgrange Date/Time with a Polished Finish and a Quartzite White Dial 50/50
Ex VAT/Taxes (For UK and EU countries VAT is added at Checkout). Newgrange Date/Time, Polished finish with a Quartz White dial. Limited Edition 50/50.
Prêt-à-Porter
Newgrange Date/Time with a Brushed Finish and a Greywacke Grey Dial 10/50
Newgrange Date/Time with a Brushed Finish and a Greywacke Grey Dial 10/50
€2 115
Newgrange Date/Time with a Brushed Finish and a Greywacke Grey Dial 10/50
Ex VAT/Taxes (For UK and EU countries VAT is added at Checkout). Newgrange Date/Time, brushed finish with a Greywacke Grey dial. Limited Edition 10/50.
Prêt-à-Porter
Newgrange Date/Time with a Polished Finish and a Greywacke Grey Dial 10/50
Newgrange Date/Time with a Polished Finish and a Greywacke Grey Dial 10/50
€2 115
Newgrange Date/Time with a Polished Finish and a Greywacke Grey Dial 10/50
Ex VAT/Taxes (For UK and EU countries VAT is added at Checkout). Newgrange Date/Time, brushed finish with a Greywacke Grey dial. Limited Edition 10/50.
Prêt-à-Porter
Newgrange Date/Time with a Polished Finish and a Midnight Black Dial 20/50
Newgrange Date/Time with a Polished Finish and a Midnight Black Dial 20/50
€2 115
Newgrange Date/Time with a Polished Finish and a Midnight Black Dial 20/50
Ex VAT/Taxes (For UK and EU countries VAT is added at Checkout). Newgrange Date/Time, polished finish with a Midnight Black dial. Limited Edition 20/50.
Prêt-à-Porter
Dowth Date/Time with Quartz White Dial 25/50
Dowth Date/Time with Quartz White Dial 25/50
€2 115
Dowth Date/Time with Quartz White Dial 25/50
Ex VAT/Taxes (For UK and EU countries VAT is added at Checkout). Dowth with White Dial. Limited Edition 25/50.
Prêt-à-Porter
Dowth Date/Time with Greywacke Grey Dial 05/50
Dowth Date/Time with Greywacke Grey Dial 05/50
€2 115
Dowth Date/Time with Greywacke Grey Dial 05/50
Ex VAT/Taxes (For UK and EU countries VAT is added at Checkout). Dowth with Grey Dial. Limited Edition 05/50.
Prêt-à-Porter
Dowth Date/Time with Greywacke Grey Dial 10/50
Dowth Date/Time with Greywacke Grey Dial 10/50
€2 115
Dowth Date/Time with Greywacke Grey Dial 10/50
Ex VAT/Taxes (For UK and EU countries VAT is added at Checkout). Dowth with Grey Dial. Limited Edition 10/50.
Prêt-à-Porter
Dowth Date/Time with Midnight Black Dial 01/50
Dowth Date/Time with Midnight Black Dial 01/50
€2 115
Dowth Date/Time with Midnight Black Dial 01/50
Ex VAT/Taxes (For UK and EU countries VAT is added at Checkout). Dowth with Black Dial. Limited Edition 01/50.

Made-to-Order Watches

Limited Edition of 50
Knowth Date/Time
Knowth Date/Time
€2 350
Knowth Date/Time
Ex VAT/Duty (For UK and EU countries VAT is added at Checkout).
Limited Edition of 50
Dowth Date/Time
Dowth Date/Time
€2 350
Dowth Date/Time
Ex VAT (For UK and EU countries VAT is added at Checkout).
Limited Edition of 50
Newgrange Date/Time
Newgrange Date/Time
€2 350
Newgrange Date/Time
Ex VAT (For EU countries VAT is added at Checkout).
Limited Edition of 50
Newgrange Moon Phase
Newgrange Moon Phase
€2 600
Newgrange Moon Phase
Ex VAT (For EU countries and the United Kingdom VAT is added at Checkout).

Straps and Buckles

Standard Quality
Standard Strap Assorted Colours
Standard Strap Assorted Colours
€75
Standard Strap Assorted Colours
Ex VAT/Taxes (For UK and EU countries VAT is added at Checkout). Standard Calf Leather Strap (without pin buckle)
Branded Sidereus Pin Buckle
Branded Sidereus Pin Buckle
€50
Branded Sidereus Pin Buckle
Ex VAT/Taxes (For UK and EU countries VAT is added at Checkout).

Payment Cards

Payment Cards may be used to pay a deposit or towards payment for a watch or strap.