Vintage Seattle Local 751 Aeronautical Mechanics A. F. of L. Lapel Pin

Description

In the center the enamel is red, white, and blue and in the middle of 3 of the colors are A. I. and M. and don't know what the I. is for. On the back it says "Green Duck" and "CHI." for Chicago. 2 other marking at the bottom. It's a screwback but I don't have it so that's why the lower price.
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