Dad started making early Snuffer prototypes in the early 1960's by cutting up Ben Pearson Deadheads and silver soldering back together as 3 blades. These were called "biscuit cutters" and he made both large and small from the 2 Deadhead sizes. When he was getting ready to make the straight bladed ones he made a bunch of prototype sizes from 1 inch to 2 inch diameter, probably every 1/4 inch increment, and took them to Colorado where he was hunting in a camp where quite a few mule deer were killed every year. He handed them out, kept records, and decided the 1 1/2 inch size was best.
Early Snuffers - say from the '70's to mid 80's had a more squared off back vent where the blades meet the ferrule than yours - they are the later rounded style. They also progressed from a pin in the tip to a cone prior to grinding - the tip insert was several RK harder than the blades for strength.
The head was sold to Delta Industries around 1990 and they made at least a couple sizes. They also had problems with heat treating and produced a lot of hard heads that were difficult to sharpen. They made several sizes - for sure 125 and 160 gr without adaptor. They also made some 2-bladed Snuffers then.
Magnus bought the head probably 1996-1998 and they got a handle on quality control. They did not make 2 blade Snuffers as far as I'm aware - of course they had their own 2-bladed heads. Magnus made, I think, 110, 125, 145, and 160 grain heads (without adaptor). The only difference in these sizes was how much blade was ground off - they all started the same. By getting down to 125 gr the blades were getting pretty thin.
Magnus quit making them a couple years ago and now Thunder Valley is making the head.
All of the "1st run" Snuffers were black. We progressed from auto primer black spraypaint by hand to dipping in rustoleum black (I spent many a summer day painting Snuffers in my misspent youth!). We had a few Teflon coated around 1990, both black and green, I killed a buck with one of these, this was pretty early for Teflon coating broadheads. We didn't see any advantage to it - actually the coating was more prone to scratch than paint due to the finish.
Occasionally an off-color Snuffer will pop up - we used to sell cosmetic 2nds - uneven weld, uneven grind etc - out of the house for $1 each - sold thousands that way over the years. These we would hit with auto primer to differentiate from the "1st run" heads - I've seen white, gray, auto red, brown, tan over the years - we just used whatever was laying around. I think Magnus did this some as well.
I'd say yours look like 145 grain heads to me - don't look thin enough for 125's, but you can see blade width tapering towards the back - look like a 145 profile to me.
R