They're hard to come by and I haven't seen those handles very often on any pattern. I collect Camillus 72s and their clones and the only reason I have one with those handles is because it was gifted to me by a very generous fellow collector. During my search, I think I only saw one on eBay.
Those handles don't show up in any of the Camillus catalogs I have access to so any guess as to the years made would just be that, a guess. I hope someone comes along who has some information on them. I too would love to know.