Jab

Funny, didn't see a Haynes manual for W123 Petrol (200).

For what it's worth, here is a list of what Haynes has to offer for W123s :

MB 200, 240, 300 Diesel (Oct 76 - 85) up to C = Book No. 1114

MB 250 & 280 (123 Series) (Oct 76 - 84) up to B = Book No. 0677

Doesn't seem like they have one for a petrol W123 200.