the left one on the picture has no hole in the single half-loop. It’s marked with “M13 WM I”. Is it an early version of the normal one with the hole (right one)? Or for export? Or whatever?
I think the one with no hole is a newer style.
but with this change in shape it should be named M13A1 (i.e.), or not?
btw: what’s the meaning of the single letters under the maunfacturer-codes? I spotted different ones in combination with different producers.
I do not think that just the deletion of the hole would be significant enough to warrant a change in the nomenclature. Are there other differences between these two links that I am not seeing? I beleive that the different letters may indicate which machine or station or forming die that the link was formed on for quality control purposes.
I’m not a link expert by any means but long ago I collected them along with everything else cartridge related!
There are no other hidden differences between the links.
Thanks for your opinion about the single letters.