I am no expert on M assignments, so buyer please take note. I have four of these. The two on the left both bear the Locke Victor insulator trademark. The one on the far left has a flashover, but neither exhibit any other physical damages. The one on the far right is embossed "Locke 1929" with no damage. The one out in front has no markings and just a smaller than a dime size flashover spot, but no other damage. I am asking 10.00 each or all four for 30.00. At your request, I will deliver these to Springfield on Nov 1 or 2.