Does this 'more or less' mean I will get a perfectly functioning camera, an invoice and a 6 month warranty (if the CLA is stated, of course)? Because then I might go for it!
of course not. I made the comparison with 2nd hand cars that have been self-serviced. The only way to get an idea is to have yourself experience with tinkering and selv-service, so you can get a rough idea. You are on your own.
This is relatively to OP comment about frequency of listings claiming DIY servicing.
Otherwise don't go on ebay or go on it by a previous search. For instance when i was looking for a Rollei SL66 I went on google.de with "Rollei SL66 überholt/werkstatt überholt" which brought few street stores like Heidi in München, Wiese/Fotohandel in Hamburg, and their respective listings plus couple other listings on ebay. Or search in for überholt on ebay.DE. As for me it was about getting a cheap 1-hour plane ticket to Hamburg, go talk and examine couple cameras in store, buy it, have some Astra pils, shoot the camera around in Hamburg and take the next morning plane to Oslo and develop the rolls back home. Done, why bother with online, I get Germany around the corner and it's full of Rollei. Leica, Linhof, Pentacon. Once I was thinking of a Hasselblad 1000F so i went looking on swedish listings site Tradera and couple street shops in Stockholm, I have 4 hours drive to Göteborg, five to Stockholm, so why bother. Of course gringos in their gringoland that's something else.
But then a Rollei SL66 system isn't cheap, so a +200€ for a checkup and required basic refresh makes not much difference.
But if you are after a Salyut or Kiev-88, then 200€ is the price of the camera itself, so any service on top will add significantly, unless you live in Ukraine or Russia
if you want cheap you must try your chance. For instance if you want cheap AND checked by a pro, soviet stuff, you have guys like the ones working under ebay account yurets.perfect (
https://www.ebay.com/usr/yurets.perfect?_trksid=p2053788.m1543.l2754) these guys ARE micro-technicians, who do watches and cameras, they sell overhauled/checked cameras with a 14-days return right and send you a demonstration video with the sale. Have a look at their prices and it's more than most other sellers of soviet stuff. They are pro, though you can't check by yourself, because a cetificate/diplom of fotomester in russian means nothing to you ...