Super Ikonta "C"
What's wrong with your finder? Is it the alignment? Calibration? Horizontal realignment is easy. Vertical alignment can be done, but you'll probably think it wasn't worth it afterward. I've done both types of realignment and calibration, on Zeisses and Moskvas.
The later version of the Super Ikonta "C" uses an Albada type viewfinder. The earlier version uses some good old regular lenses. (This is the viewfinder, not the rangefinder.)
The Ikonta's Albada finder has a front lens which consists of two pieces of glass stuck together with probably Canada Balsam. One of the glass elements has a semi reflective mirror, (I think, similar to a beam splitter) This semi reflective mirror will reflect, to your eye, an image of a target rectangle which is on the rear component of the finder.
(But you probably know this)
This front element becomes difficult to see through in time, perhaps because the Balsam darkens, perhaps the glass darkens, or the silvering of the semi reflective mirror has reacted with the glass or the Balsam. I really dunno.
The issue is, that whatever the cause, the viewfinder becomes difficult to see through, not impossible, just difficult.
Now, the rangefinder, however quaint on these cameras functions very well and I've had no problem aligning them.
I'd like to know if anyone has had any success in sorting out this Albada problem.
I have considered trying to disassemble this front element using heat or acetone and then cleaning and reassembling the thing with new balsam after redoing the silver coating.
This is a little scary to me, but I think I'll try it. It would be nice to know if anyone else has tried this.