Broken Caliber 77?

Hi there,
I got an old caliber 77 and a few months ago it just stopped working, does anyone knows where can I find cal 77 spare parts to try to fix it? I sent the watch to an authorized IWC repair center but they could not find the right parts.

It would be good to see a picture of the watch.

Cheers from the cellar

Here it is:

Return it to the seller!!