Based on your pictures I think you have definetly identified 3 different versions. I know when we were looking at tool differences for SAMM's page and other peoples requests we often found small changes like those shown between v2 & 3. I think the most recent one was the variations in the small Clip-Point, but even the relatively recent mini-screwdriver seems to have several small changes not including its more functional handle hex shape. Nowhere near all these changes could be recorded with any accuracy as I'm sure they probably had plenty of each variety while they were building tools, and then probably released some from their stock piles and the warranty repairs got less for certain models. I think that is why we can occasionally see a fluted corkscrew on a knife where time wise it just does nto fit.I'll take a look at my Combo tools again as I have time, when you compare combo tools are you always looking at 84mm? Near as I can tell the 91mm and 84mm tools are the same tools with thie pivot hole set accordingly. The thickness might vary as well at the Tang, but I have to check that again.I know in the past there was some talk about the offset angle of the tip changing on the tools, but I could not conclusively confirm that at the time. I think it was related to 91mm Combo tools, but are there really any differences?