After being schooled (in more ways than one) by the Library=>[64 1/2-70] Mustang=>Article List => Anghel Jack PDF I've been finding a jack or two.
I was surprised to find a Mustang jack at my local old car pick 'n pull. Ok, I had to go through a heaping 4'x4'x2' metal tub of jacks, but I found a style of date I haven't seen.
It was marked 9G28. I haven't seen the day of month before, but I've been diving into 67s lately which don't offer days (so far as I've seen).
Is this unique to certain years? It's an R/H.