I have some information for you. The 25 was introduced early 1925 (or maybe very late 1924) and was replaced by the Model 29 probably in late 1928 (the 29 is found in catalog price lists from very early Jan of 1929). In recording serial numbers on these I have never found one over 26,400 so yours is later production.
The 25 was just an overall improvement on the Model 1914 that it replaced. The patents are the same ones that were stamped on late Model 1914's, there were no new patents for the 25. The Dec 25, 1906 patent is for the Model 1903 pump and would have been expired by the introduction of the 25 - the 1914 was basically just a 1903 modified to tube magazine feed and the later two patents are for those modifications. The 1903 and 1914 share a number of parts, but even though it's just an improvement, and the parts are similar, just a few minor parts of a 25 are shared with the earlier guns - even the tube magazine parts are different enough to not inter change with the only exception possibly being the spring.
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