Dutch target arquebuse dated 1630

[Marcus den toom]

The barrel has been repaired and cleaned. The percussion tower has also been removed. This revealed a second possible screw hole, since filled.
My idea is the barrel had a screw on powderpan.
Attached pictures

The lock could than just have been a rectangular snap tinder lock.

[Raf]

My idea is the barrel had a screw on powderpan.

It's a reasonable idea especially since the front drilling is offset avoid drilling into the bore . Otherwise what are these holes for ? For clarification is the hair / set trigger arrangement part of the trigger assembly as in the x ray image in your previous post?

[Marcus den toom]

Originally Posted by Raf

For clarification is the hair / set trigger arrangement part of the trigger assembly as in the x ray image in your previous post?

Yes the trigger assembly is one part with a set trigger system.
I have asked the Rijksmuseum in Amsterdam for pictures of the inside of the rectangular locks. These internal pictutes would complete the puzzle.