10,200 GBPhttp://www.bonhams.com/auctions/16253/lot/272/
A total of approx 15,000 square fours were made (in all versions) between 1931 - 1959.
This is a 1938 4G (1000cc) in top class nick.
The way i read it was the OHC 500 was the early idea, but revised and…released as the 997 whatever OHV ...
An ex-work buddy who I haven't seen for a couple of years has a few (7 or 8 ) that I've seen, but think he has maybe 15 or so...