M110 8 Inch Self-Propelled Howitzer Hat or Lapel Pin. The pin is approx 1 1/4" wide, antique silver (dull) and have 2 posts to keep from turning like single post pins.
Ā There are ONLY 50 initially available (as of this over 25 sold) so order soon as there is no limit per person and some are planning to order for their entire gun crews.