Sidereus Watches
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Sourcing & Build
Community verifiedSourcing Notes: Sidereus Watches is an Irish independent watchmaker. Each watch is hand-assembled, regulated, and tested in Ireland in strictly limited runs of 50 pieces per variant. The Newgrange, Dowth, and Knowth Date/Time and Moon Phase models use a modified Swiss-Made Sellita SW200-1 automatic with a custom rotor and élaboré-grade finishing, viewable through a sapphire display caseback. The Réalta GMT uses an under-dial GMT disc with a dual-tone day/night background. Cases are two-part stainless steel (polished, brushed, or vapour-blasted) with sapphire crystals and screw-down crowns rated to 5 ATM. Dials are stepped, slightly domed, with proprietary semi-skeletonised hands. Nice.
Cost Transparency
Ships from France
Current Rate
10%
6% HTS + 4% Section 301 (forced labor)
Est. Duty
$214–$320
on $2138.34–$3201.79 watch
For UK and EU sales VAT is added at checkout. Export documentation processing required for UK and EU orders.
EU is capped at 10% total including MFN duty under the Section 301 forced-labor tariffs effective July 24, 2026. With a ~6% HTS base rate, the incremental Section 301 duty is 4%.
Tariffs are assessed based on where the watch is assembled, not where individual components originate. A watch with a Japanese movement assembled in the US incurs no import duty.
Learn more about watch tariffsDiscover More
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This page was last updated: August 19, 2026 at 1 am