70's Hematite Cufflink Set - Alaska Black Diamond Jewelry Set - Accessories

This is a pair of "Alaska Black Diamond Jewelry for Men" cufflink and tie tack set. The grey lustre squares (hematite) are surrounded by a braided gold tone edging and gold chain look "bands." I am guessing these are from the 70's or 80's. Not really sure. In excellent vintage shape, there is very light wear (looks like a smudge) to the hematite stones and the box. Also, the tie tack chain hangs freely? Please see the pictures for details. Please note that I cannot guarantee authenticity of the stones or the metal. Cufflink Length: 2.5" Cufflink Width: 5/8" Tie Tack Width: 3/8" Chain length: 1 1/4"