I have to have a look more closely tomorrow at the lens. I am thinking I need to get the front cell out and the rear cell (already taken out before), and then see what I'll find out from the inside.
I'll see what I can find out about the solder. Since the iron ring is straight cut and the aperture ring itself is bevelled, there is a bit of space, where the solder might have run down. But in that case I am not sure the aperture would even move (solder seeping down in the crack) - which it does.
I can supply a few more close-ups if someone feels like it.
The lens is labelled "Rapid Weitwinkel Aplanat F12 Serie III No. 3" with a serial number 55212. It was advertised as an Emil Busch, but I have no idea how the seller came to that conclusion. In this particular case, there is very little evidence of the lens being anything even remotely valuable.
I have not much in the way of advanced tools, so I am just going to go easy on this one. Or just bury in the woods and make a treasure map.
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