A Guide to Collecting Early and WW1 Trench Watches: The Birth of the Wristwatch and its Baptism in WW1 - Kindle edition by Haynes, Ian, Marriott Smith, Richard. Reference Kindle eBooks @
WW1 1917 SILVER HALLMARKED TRENCH WATCH MILITARY ANTIQUE VINTAGE MENS WRISTWATCH | eBay
CHF Tissot + Fils WWI Signal Corps Wristwatch - petersuchyjewelers
Trench Watch History in WW1 | WW1 Trench Wrist Watch Evolution