First of all, great thread. Great information. I looked searched thru all the Hollywood crane threads I could find here and this was helpful.
I bought a used Hollywood crane with different decals, but looks almost identical.
When it arrived, I found out it was missing parts for the claw mechanism and there was no visible seconds timer from what I saw.
Also the rails had some really thick grease which slowed the movement of the claw, but still was playable. The cabling above the rails seem to be tangled and sometimes would dangle in the way of the rails & carriage and impede the movement of the claw.
The claw was not hooked up, it is resting on a table right now. From comparing mine to the OP's machine, looks like I'm missing just the coil from the carriage to the claw, and also the some kind of screw or clip to connect the neck/top of the claw to the carriage. I'm unfamiliar with cranes, but starting to learn lots for sure!!
I hope to get more detailed pictures, but here is what it looks like. Also a picture from the manual in which I highlighted the areas of the part I think I am missing.