Any Idea for this thick font?

Hi Ken, this looks like a hand-drawn version of Modified Roman Raised. There were several versions of this available as plastic stencil press alphabets beginning in the late 1960s, but I regularly match hand-drawn variations for several customers who use the Inscription Matching Service. I have a digital version designed to match the plastic alphabets produced by the PMD company for their Cutrite line of alphabets, here: MLC Modified Roman Raised PC. It will be similar, but ultimately not exact and would need adjustments to match this.