OK, I knew I sandblasted a "MAV". After 20 minutes of looking, I found it on the rear shock support of my 1972 Maverick.
Now that you mention it, I got these parts from someone on the forum (mustangstore@comcast.net). So maybe its was stamped by them and not stock from a 1972. It was definitely used, but blasted and painted, anything looks new!
Yep, and that "L" is crooked. It must have been stamped by the seller. And I thought I finally found something, but way too easy!