Before Hakam Din began selling stenciled Chinese brasswinds, they produced a series of trumpets and cornets at their factory in Sialkot.  The 81P designation was on their old website - https://web.archive.org/web/20040704190740/http://hakamdin.com:80/products/corne... / https://web.archive.org/web/20050308231059/http://www.hakamdin.com:80/cornets_tr...
Valves are marked 16, 17, 18 in the European manner, with a 6 on the second valve casing, no serial number on the bell like other pockets [i.e. in the Nick DeCarlis collection].  West Pakistan implies pre-1971, technically 1955-1970 under "One Unit" policy.  The two-digit NY code implies pre-1965, though horns only marked "Sialkot - Pakistan" [no West] have also had the two-digit code... https://drive.google.com/drive/folders/194-VlOr-QNB2X2WU88lSbVoutW0zFGwl?usp=sha... - hard to say exactly when it was made, but 1950s-60s is probably it.

This has a standard trumpet receiver and plays okay, but not the most secure slotting [big surprise].  Definitely miles ahead of the usual instruments from this region, and an interesting design compared to Hakam Din's newer offerings.