Thanks Kurt, you'r all welcome! Not that I'would know anything about this computer stuff, but some principles I understood I can pass along - so no big deal showing how this works.
English Coins,
were used to measure the weight of almost everything in good Ol' Brittain - instead of grains or grams etc.
These arrows look somewhat British to me and might be made in the UK!? If so, there would be a marking of their weight. Something like "6s 4p" [= 6 shilling 4 pence]. This would be the actual weight of the old English coins - and, BTW was also a/the measure for spine, which was not known the way we talk about it today.
I was just curious if these are of English origin ... and how weight markings compare to actual weight, checked by digital scale, maybe?!