What do you guys think is normal/fair for labor?

I brought my 1983 300 Turbo Diesel to a garage in Los Angeles. I was impressed by the size of the place, the friendly staff, as well as the 15 or so immaculate MBs there (which mine certainly is not). It almost looked like a museum.

After the bill, I calculated that labor was $75/hour. Is that alot? Or fair? I have to say that they seemed conscientious, but I'm curious if I happened to have been to an expensive garage or if that's what i should expect to pay.

Sorry for the tacky money question.