PLYMOUTH – The Plymouth Borough is auctioning a Colt Thompson Model 1921 AC .45 Navy Overstamp Submachine Gun with one stick magazine. The electronic auction will begin at noon, March 1, and end noon, March 11, 2017. It will be conducted by Gun Broker and all interested parties must register and bids will be taken at gunbroker.com. There is a minimum starting bid of $20,000 and a reserve, which means the borough can reject any and all bids under the reserve amount.