There were several Bodkin models, the last one appeared about 1990 if I recall that one right. As already being said above, they are cheap, common and not rated high as collectibles, but may serve you well for your hunting!? So if you like them, get them and use them.
Unlike the M-A3 broadheads (which started as a Bodkin) all following Bodkins only had a SINGLE layer of metal forming the cutting edge. Only the very tip being double thickness. So the sharpening is not a problem here.
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spelling my name:
Well, I know you all would like to pronounce my name Faulk, but it is only Falk (german for falcon BTW) and the "a" is pronounced like the last one in "America" - and you all can do that, don't you?