So my friend got around to sending more pics from around the M37, this is stenciled on the inside of the hard top. I’ve heard about having to replace the insulation in these removable hardtops, never seen a number on them. I read military body numbers are painted over before being released, in some cases the only way to really find the number is to sand down the hood carefully. But I don’t know what this is, I will have to show it to the M37 community.