I have an old Mont Blanc 344, used for many years, but now cracked right across the barrel more or less at the joint between the clear section and the lower part.
I have tried cyanoacrylate, which failed after a while probably because it's not waterproof; recently tried solvent welding with acetone but no joy.
Grateful for any repair suggestions.
If it's a hopeless case, would be good to know which other models would have a compatible barrel, e.g. 24x, 14x, as they seem to be somewhat rare (and very expensive!)
Also curious about its age.