It’s worth mentioning that this cartridge is either designated 2 Pounder, 1.65 Inch, or 42 mm, and that its case length may vary between 150 and 154 mm. Also, it was used with three different type of primers: friction primer (early primerless case with vent hole, see drawing below), short percussion primer (battery cup), and 20 grain percussion primer (with flash tube).
The substitution of the friction primer mechanism for the one using cases with percussion primer was recommended during 1895.
Frankford Arsenal completed the manufacture of the first lot of cartridges between 1893 and 1894. These have Hotchkiss patent tinned cases and percussion primers.
FA draw stages:
FA cartridges (case, canister, explosive shell [old model], explosive shell [new model], sectioned case):
The first gun in this caliber was procured in 1877 and later purchases were issued by the Army in 1878, but they were not recommended for adoption until 1881. By 1908, they were considered obsolete and/or unserviceable and disposed for sale.
John, you are right about Bannerman, he offered both army and navy guns and its cartridges in several of his catalogs. Below you can see scans from the 1927 and 1945 catalogs, respectively.