It is an 11 jewel 18 size full plate grade 13 Elgin. There were 155,000 grade 13's in 38 separate runs. The manufacturing date is approximately 1876, which was the 10th year Elgin was in business. This movement is listed as a Hunter Movement, although, your watch may be in a hunter or an open face movement. This information is from the Elgin Online Database: http://elginwatches.org/databases/elgin_sn_intro.html Please copy and paste this link into your browser, as you can NOT link directly from this site. What type of case is the watch in Goldfilled, Coin? Many of these old watches run incredibly well for being 125 years old, and many of them have a real thick bevelled mineral glass crystal, that really could take a beating.