Gun Barrel ID

[kahnjar1]

Your point is taken re variances. My comments are based on three very notable authors who have researched world Proof Marks. They are W.W Greener, Mr Lee Kennett and Baron Engelhardt, all of whom have published works on the subject.
Regards Stuart

Originally Posted by Andreas

A reasonable assumption, but it seems that there were variations within the basic design of these early crown over crossed sceptres marks, please check the pics below. In numismatics a similar situation is called a die variety, variations in a coin’s design that are attributed to the die from which the coin was struck.
Regards,
Andreas