Selling on eBay since 1996!
The pin shows minor wear. Size is 2.5" x 1.75". No identifying markings as to age or exact origin. The metal looks to be either aluminum or pewter.
I am always willing to combine shipping on like items when possible. Media mail items such as books can only be shipped with other media mail items because they ship at a much lower rate. Priority mail items may be combined with other priority or first class mail items.