FEC marked model 64 Smith and Wesson

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So stopped by GS that sells a lot of Firearms to agencies. In the used case was a model 64-3 with FEC engraved under the barrel followed by a three digit rack number. Salesman said he had a box of them and brought out about 20. All FEC marked with sequential rack numbers. A couple were like new, most were average, with a couple well worn. They wanted 300.00 for any. Picked out best and put it on their 3 month layaway, as I hadn’t planned an a purchase. Salesman said thought they came in on a federal trade in. To me FEC would mean Federal Election Commssion. Any thoughts on if this is what FEC might mean.