maybe early 60s, but not later. My first longbow was a Blackhawk just like that, same model. Mine had bright yellow plastic on the back face and white on the belly side. That's right, that's not fibreglass but simply a plastic of some sort. A lot of the Cravotta Bros bows had the same stuff. Look at yours and/or the other models- you won't see any glass fibre in there. Mine was actually a pretty darn good shooter. 50#. I wish I still had it.