Mark on an early barrel

[Ed]

I was perusing the Osprey book "Medieval Handgonnes" and the author referenced a very similar barrel in Denmark.

https://samlinger.natmus.dk/thm/asset/43719

He says that there is a makers mark "I S" on the rear of the barrel.

Hmmmmmm ... "IS" mine has "IV" could there be a connection???

Take a look at the rear of the barrel:


The date of the barrel is 1515.

See the prob?

BTW, you find anything further on the barrel I bought from you?