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
16%
6% HTS + 10% Section 122
Est. Duty
$299–$448
on $1870–$2800 watch
⚠ Current Section 122 rate expires Jul 24, 2026 — rates may change.
For UK and EU sales VAT is added at checkout. Export documentation processing required for UK and EU orders.
EU framework deal paused after SCOTUS ruling. Currently flat 10% Section 122.
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: May 25, 2026 at 4 pm