Check the listing for details. Hamilton model 21 Ship Chronometer Repair Manual on THUMB DRIVE. Condition: Brand New. Listed at 16.99 USD. Hamilton Model 21 Ship's Chronometer Repair Manual from WWII Description: Adobe pdf file on a USB thumb drive to put into your computer. The original Hamilton Model 21 operation, set-up, and repair manual has been professionally scanned and converted to an Adobe Acrobat document. Over 90 pages of information with clear diagrams, parts lists, tools needed - everything you need to be able to work on this great timepiece. This chronometer was issued to the Navy fleet boxed with gimbals. This is the 14 jewel large spring detent chronometer model 21 and was the master time piece placed only on the major ships. Most computer users who use the web have Adobe Acrobat installed, or you can install it for free. Note we have been repairing these chronometers for over 25 years and have many parts for them. Also check our other items for sale on our ebay store WatchDoc or on watchdoc.com. Terms:International Orders - We have sold hundreds of items over the internet to many, many satisfied customers (check our feedback). My aim is to please you. I give positive feedback to all customers soon after payment is received, so when you see feedback, you know I have received payment. Please give me positive feedback after you receive your item. Check out our eBay store for more watch repair manuals, tools, parts, etc.