I have a 1974 Mercedes 280C with a M110 DOHC engine. The distributor drive gear has several broken teeth so it jumps timing. This is a double gear that runs off the timing chain and connects to the shaft with the worm gear which turns the end of the distributor shaft. I have tried to locate this part with no success. It's as though it never existed...
Does anyone know where I could find this gear?

How about part 53 in this link

Каталог MERCEDES

Part number 1100500206

Is that what you mean?

This "Russian" EPC can be accessed via EverythingBenz - Mercedes-Benz Forum and Web Search Using Google

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

Stretch:

From the OP's description I think it's the intermediate gear #59; the double row chainwheel that drives the intermediate shaft. M130 P/N.

Thanks Frank - for future searchers part number for #59 is 1300520002

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!