Andy,
Your statement that the SS was an Elite Unit and could not accept 25 different Death Head styles. Based on what??
Take the 98/05 SS Bayonets that are mostly engraved. You will hardly find 2 alike. These were done in weapons work camps with slave labor. There are minor differences in the size and geometry of the TK, Runes, & Numbers. Elite SS Unit didn't have Elite Slave Labor! Maybe you can show us something from an SS Quality Control Document that can verify your statement.
Metal stamps wore out & or broke. You get a size variation when a stamp is worn & dull.
Richard K