First watch sold by the new 1894 Gruen Watch Co. in a case made in their new Ohio Gruen Watch Case Co. is the best movement source they could find, the German Assmann using the Grossmann
poised pallet, hair spring and chronometer balance escapement with gold parts. Fred and father wanted to have the best watch possible to start their new business. These were in U.S. 18 size and 16 size. I believe only Gruen marked hunter cases ever made were for these; mostly open face. Started with serial number 6200. 1894 to 1904 when Leo Alby of Madretsch, Swiss started with the fine 16 size 21j Grossmann escapement railroad style in open face and did the new 10 size Veri-thins Assmann would not do. Lucky to get the best of these in 1902 inscribed hunter case 16 size 20 jewel from NAWCC member acquaintance. Ebay trader, but did not list this one, cost less than twice scrap value. Sellers photo, mine of the Madretsch rr.
Note the huge winding wheels with odd formed teeth for smooth winding. Quality feel. Even has the Grossmann screw thead regulator along with the Grossmann escapement. A swiss made German watch. Made to be the best rr. Canada used a few. This marked by Canadian source I think.
