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The 10-size watches were produced in the early 1920's, in 17, 19 and 21-jewel models, and are marked 'Pat'd '21'. Guitar Epiphone Serial Number Lookup DOWNLOAD 9a27dcb523 Official Epiphone site: Buy electric or acoustic guitars, Les Paul electric guitars, or bass guitars. Note that the 10-size Keystone-Howard 'Thin Model' used its own serial number list starting at 1001, and cannot be dated using the chart above. Related Searcheskeystone Howard Watch Serial Numbers.In other words, you cant date a Harmony instrument from the serial number alone. It appears that the number after the H is the model number and the number prior is the serial of that batch, made in that time period. Tags: Boss Fifth Harmony Video Songs, Video, Boss Fifth Harmony bollywood movie video, 3gp Boss Fifth Harmony video Download, mp4 Boss Fifth Harmony hindi movie songs download, Boss Fifth Harmony (2015) all video download, Boss Fifth Harmony Hd Video Songs, Boss Fifth Harmony full song download, Boss Fifth Harmony Movie Download, Boss Fifth Harmony HD video Download, Mp4 Songs Download, video, 3gp, mp4 download, Boss Fifth Harmony Bollywood Songs||||||||||||||||||||||||||||||||||||||||||||||||||. A Harmony Model number is generally stamped as XXXHXX. Not to be confused with Keystone Standard Watch Company