Ziess Ikon Super Ikonta IV

In my travels this week, I came across a 534/16 with M/X sync, Synchro

Compur, and a coated Tessar 3.5/75 lens. Everything works perfect,

including the meter. Other than some small paint chips in the black

enamel on the edges and the shutter mount, this thing looks like it

just came out of the box; body is near mint. Lens is spotless and

rangefinder like new. Looks like the tripod socket and flash shoe were

never used. I did not get a case. The guy wanted $375, which I paid

without any consideration. A couple of questions:

-Was this a reasonable price?

-How old is this camera?

-How do you load film? Window is too small to see the number on the

film and I can't figure out how to reset the counter.

-Any idea where I might find a case or instructions for it?

Thanks very much...