Genuine World War 2 Hamilton Ship Chronometer model 21 Detent Support block missing the detent spring assembly, but with adjusting screws. The pictures of the chronometer and detent parts are shown from reference .  We have been repairing these chronometers for over 30 years and you are getting a good inspected part.  We are running out and only have a few more!   Note we sell the repair manual and can send via electronic transfer world wide.  We also have other parts for the Hamilton model 21 chronometer including the balance staff and escape wheel jewels etc.  Note detent parts are scarce, so don't hesitate.

Foreign orders are welcome, but note you must take care of any VAT, customs, etc that your country imposes. Member  of NAWCC and AWI. Check out our eBay store and watchdoc.com for more information on watch repair, watch parts, etc. Many thanks, Dr. Ed, the WatchDoc.