Three 4blds where found in 2003 in two separate finds , one had the patent number stamped on the blade, mine was without stamped patent on a Bear arrow and then four where found in 2012 , two stamped and two without. Extra one doesn't have stamp.
The two blade came in 100gr.144gr.168gr Not sure what ones I have extras in but have 1/2 doz of one of them on Bear arrows they came with. I'll look around here and see.
I know you don't want to loose one hunting so the 4bld is out for that reason.