It has been almost six months since I have had my hands on these engines, but I am positive the O.R. 60 had a "60" stamped on the case. I can't explain the size of the timer, as I don't know the history on this engine. She (the owner) also has the original box and a marketing brochure showing the full O.R. product line.

Thanks again Guys! You have been very helpful!

RAS