Hello, where could I buy a NOS strap for the F3, or what new nikon strap most closely resembles the original one? I would like a matching nikon strap, seems illogical but hey.
Hello, I think that the answer is at least partially market-dependent.
Nikon for example created indentations in their styrofoam inserts for things like batteries and straps but it was up to the individual distributor to actually include/not take out, or pack those accessories.
In the U.S. EPOI/Nikon USA did not include these accessories, presumably at the behest of their dealers so that they could sell them to customers, from at least ~1980-on when I bought my first Nikon [an FE] at 12 - many an allowance saved, many a lawn mowed.
Also, IIRC the straps that were/would have been included were narrow black leather or nylon straps with a ~6" long rubber neck cushion. Of course the many special edition models Nikon came out with did/might have come with more elaborate straps such as the AN-6W.
And while that first FE is long gone I have since replaced it with another.
Here is an image of my F3, alas - no original strap.