Hi Lance,
You're correct, some blade manufacturers used short blades with a swedge while others (like your Spitzer) did not. Interestingly your short model has a wide blood groove which is something some bayonet collectors go for. I had a list somewhere of observations I've made over the last 10 years or so but can't seem to find it. If you had interest, many of those observations are posted in the fire bayonet thread here on the BCN forum.
