I think it might be kind of nifty to see them all listed in one place, but I'm not sure I know them all off the top of my head, but here goes. Anyone chime in with what I miss...
The first 300 had three variations:
**Swedge that met in the middle
**Swedge that was rounded a bit
**Swedge that was squared off
Handles varied and so did the bolts
**Smooth handles
**partially grooved handles
**Both smooth bolts and slotted
Flat spine SHBM's had several handle variations
**Vertical grooves over the entire handle
**Vertical grooves over part of the handle
**Diagonal grooves over the entire handle
**Very few had smooth handles
Bolts, some had smooth bolts, some slotted, some tubes.
Some satin finished knives are out there, most are LE's some are not.
**Both slotted bolts and tubes, and at least one satin with smooth handles
**and smooth bolts (saw it in an old American Survival Guide)
I'm purposely not counting the new variants.