18,000 vph (2.5 Hz)
Swiss hand-wound Roskopf pin-lever calibre. The Ebauches Bettlach technical sheet identifies 8810 as the 30.60 mm small-seconds version, distinct from the calendar/centre-seconds 8811. The sheet documents a 17-ruby execution; secondary references conflate other low-jewel and calendar examples, so the jewel count is not reduced to a single universal value.
Last updated 2 Oct 2026Suggest a correction
TECHNICAL SPECIFICATIONS
Movement Type
Manual Winding
Frequency
18,000 vph (2.5 Hz)
Diameter
30.6mm
Height
4.25mm
Display Type
Analog
Winding
Manual
FEATURES
Hand WindingSmall Seconds
QUICK FACTS
BRAND
TYPE
Manual WindingSTATUS
DiscontinuedMANUFACTURE
In-houseCOUNTRY
SwitzerlandALSO KNOWN AS
EB8810
FOR WATCH DEALERS
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