Wolfgang:
I have heard the visible phrase prior but I think that to be in context that the marks were to be visible on the tube and not hidden behind a rib, etc. I do not think the wooden side panels were installed when the sporting weapon experienced proof. I'm fairly confident that the bulk of the marks will be along the centre rib on the left side. Note the Crown over S on the left side of the top rib. This one really piques my interest in that there is a possibility that it may have experienced proof in later 1923 or early 1924 and I contend that if a datecode exists it will be found under the panel along with some mechanics initials. Many times the tube knitter's initials are at the forend hanger which would be on the lower tube in this case.
Kind Regards,
Raimey
rse
