Quick question: Zeiss Ikon Ikonta shutter operation

A local CL ad was looking for a single 120 roll to test an old family camera, so I offered one.

Poster owns a neglected Zeiss Ikon Ikonta 6x6 (Tessar lens), in poor shape, externally.
(EDIT: compared with vintage pictures, must be Compur shutter)

I have seen it briefly, shutter feels stuck, and I did not go any further.
Could there be some shutter interlock present when the film is absent?

Bellows looked OK, but if the shutter needs serious and costly servicing, the owner may just abandon.
Should I even consider buying it at a reasonable, honest price, as a project?

If cheap, then yes. Not very difficult to take apart and clean, which may resurrect the action. If you don't do it yourself let it pass.

Meaning the shutter cannot:
1- Be cocked.
2- Be released.
3- Speed ring is stuck at 500.
4- Different write here

If you have to ask... pass on it.

reply to #3 and #4 above:
(added: it is shutter release-on the-body-type, with cocking lever on shutter)

I think it is "cannot be released", without applying more force, probably due to no action in 20 years.
I watched the end of the linkage pressing onto a lever on the shutter body, and there was not a hint of the lever wanting to move. BTW, this implies there is not interlock related to film advance, then.
I told owner to not force anything!

The reality is, owner will not fix on cost, without work done to it.
Getting the camera a low cost would be cheap tuition in pre-WWII Compur shutters. Perhaps.