These are recommended reference books on watches and clocks.
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Complete Price Guide to Watches – 2017 edition
British Military Timepieces by Konrad Knirim
Militäruhren / Military Timepieces by Konrad Knirim
Military Timepieces by Marvin Whitney$89.95
The Ship’s Chronometer by Marvin Whitney$89.95
German & British Military Timepieces (Vol I & II) by Konrad Knirim