Hi Gary,
Fine work, no doubt, but a 17th c. cannon is of course far from one of the early 15th century when it comes to historic importance.
May I add that the collection you mentioned is The Visser Collection, named after the late Henk L. Visser, instead of 'Visor'.
What is more essential, though: I think I am speaking right out of the heart of quite a couple of members when I ask you to post (or send) the offered Mörkö pics!
What I am interested to learn personally is whether that foundry you mentioned is able to found and drill out a bronze haquebut barrel of a length of about one meter.
Best,
Michael