That sure is a sweetheart. BTM metal should be aluminum. The 243 fwt came out in '55, just like so many of the others. First year of the montecarlo is '52. Yours could have had either or: Low comb or montecarlo with aluminum butt plate. As you noted, it should have sling "swivels", not sling swivel studs. Those are aftermarket. Nice for hunting with, but not original to the rifle.. Thanks for sharing Ldg. When are you going to take it to the range? We want range report!! ha ha.