A word of caution, the Contax IIa/IIIa is mechanically complex and I believe there are not many who can service them properly. A CLA will easily run you $300 by someone who is expert in working on them (and you want an expert doing the work!). That’s not a bad thing in itself, but I believe that’s something to consider when you purchase one that you may already know needs work. A number of years ago I bought a very clean IIa on eBay. Of course the shutter needed work and the focus mount was tight, it had been stored for 40 years. I sent it to my regular guy who did a CLA for $120. It still wasn’t right. Sent it to a specialist and it came back perfect $300 and 6 months later. Wonderful camera with great lenses. Those “C” Nikkors are great and the FSU Kiev lenses can be excellent and very inexpensive.