Machinists Union 15 Year Service IAM Screw back & Butterfly Clutch Lapel Pins

Qty. 1 Machinists Union 15 Year Service IAM Screw Back Lapel Pin. Qty. 1 Machinists Union 15 Year Service IAM Butterfly Clutch Lapel Pin. Still in original cellophane and on cards. IAM 15 - International Association of Machinist 15 year service. Bastian Bros. Co. Rochester, N.Y. Black enamel, and I believe they are 10K Gold Filled. 1940's? 1950's? I left the cellophane on for the next collector. I am unsure of their condition, but I was able to peak in one side that was open and take a photo of the backs (one side shot). I could see a little oxidation on the butterfly clutch. Please see all the photos. UL30D4