I am no expert on M assignments, so buyer please take note. The M-2703 on the far left has the Locke insulator trademark & 1044, The other two are unmarked. I am asking 10.00 each for the two on the left which have no damage, and 5.00 for the one on the right which has a hairline width crack in the back. Take all three for 20.00. If interested, I will deliver these to Springfield on Nov 1 or 2.