Thank you Michl, but i still have doubts about the interpretation of this mark. It might just be my perspective beeing a bit off.. but i can see either a crude 1592 (especially the 5 and 9 are vague) or ISE with the E not in good shape.
The question is if you should read this as other mark SUL? The SUL are stamped within a square and are raised, the ISE is in the same manner. 1592 would be stamped without a boarder/sqaure around it and stamped inwards.
I have no knowledge (beeing 0-5%) on how stamps where made in those days.. i do know it is more common for dates to be stamped inwards without a boarder to highlight them.
Tomorrow there will be a good day to learn a new fact on firearms i feel... Michl, fire away
ps is that musket you fired/flashed by any chance the Montecuccoli?