91mm has 2mm thickness
just measured with digital calipers the thickest part of a few blades in my collection84mm has 2mm thickness91mm has 2mm thickness93mm (alox) has 2.7mm thickness111mm has 2.4mm thickness130mm has 2.5mm thickness
I think a few years back 91mm blades were 2.4mm (before the "bump" in the liner was added to make up for the smaller thickness). Even longer ago, blades were 2.7mm. I don't know when those changes happened though. I'm not very good at dating (in general, SAKs specifically).
I measured the unsharpened part, is that the tang or ricasso ?