Nice one Eric! I think that may be a grade 637.I have one like it, my daily work watch, also lever-set and has the "3 positions" under the balance like yours.They're street railway watches.Mine has a double sunk Montgomery dial marked "Waltham Electric Railway".My SN is 18092585.Makes a great carry watch, accurate and bulletproof.Thanks for showing it....Ted.
Posts: 1323 | Location: Lebanon, Connecticut USA | Registered: March 28, 2008