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Quoting some post:
"N-140 represents the Navy Purchasing Office New York"
" it seems that when you have a N140 with two sets of contract numbers it is post WWII"
On this thread there's no mention of the NSSX contracts, just NXSX or NXSS.
Thanks both, still not 100% whether I'm watching kosher or good repro jackets in this case (serial numbers not quite 100%), but I'll monitor the bids to see whether they go too high.