Grand Prix Calendar Auto Orient 30 jewels, for parts, currently not working. No back cover. Parts are missing, please check the photos. The photos are everything. There are no other accessories. Please be sure to judge by the photos. I will sell it to someone who is okay with this. I tried shaking and winding the mainspring, but it seems like it might move but doesn't. The rotating rotor rotates properly. The arm moves when the rotor rotates due to the structure that hooks the arm on the inner mechanism. The calendar changed over at 12 o'clock, but it cannot skip. How about it for parts, etc.?