First, heartly congratulations to the OP! An amazing find!
This camera, IMHO, is significant enough to warrant extreme caution. My own IIIa came from HS with incorrect screws holding the front plate. It was irking to me, but I happen to repair most of my cameras myself (the IIIa was the first and probably the last to be farmed out), and I know sometimes screwheads do break, or screwdrivers slip and damage the heads. So, while it bothers me, it is not such a big deal-in my humble IIIa. In a Jena Contax it would be catastrophic, again in my humble opinion.
I must again, as I've done lots of times here, side with those that are amazed by the idolatry towards that repairman. Maybe I was very unlucky, but my experience has been... less than satisfactory, perhaps? You be the judge:
I've been using my Contax for over 30 years. Before me, my dad used it since new. In 51 long years, travelling in five continents, many times in harsh conditions, it never malfunctioned in any way at all. It went to the Sahara, to the top of the Matterhorn, many times to the rainforest without missing one beat. I trusted my camera blindly, and it is my sole system. Spare bodies seemed an abusrd idea for me.
Then, a few years ago I had the brilliant idea of having it serviced by who appeared to be the most reputed repairman. When it arrived, I was bothered by small details- the incorrect screws, the red lens-mounting dot paint that peeled at the first use.
With time, it came a second, more serious problem: the new meter cell was dead, and I had to replace it. The 51 year old one never went west- I just had it changed out of "precaution". And now, the shutter is capping at all high speeds. In a camera that worked perfectly during more than 50 years, and was "overhauled" only a few years ago.
It seems to me that I lost a considerable amount of money and time. But more importantly, I lost the confidence in my primary 35mm camera, the one I loved to use during decades.
