I have the mount for one of the big perfs. The dish was damaged when someone tried to crush a 55 gallon drum with it. I think that is when the motor armature overheated and went out too. It is laying face down in the grass and I did not accurately measure it, but it has to be at least 9.5' or more. But I am thinking about flipping it over and see if I might straighten it to work again.
Ouch, that's a shame to see one of those beauties damaged.
AKAIK the H-H mounts (after a certain point) were the same for all the BVs (solid/perf/whatever diameter) but I could be all wet on that.
I would be very interested in a good measurement on that dish you have. I have only verified the existence of 1-9'-6 BV dish, and it was a solid.
Got to be more out there though...somewhere.
There seems to be a lack of good info on these dishes. At one time I posted to the Wichita, KS Craigslist just looking for ex-employees to chat with but drew a blank there.
Hope you have one of the big ones and you can straighten it, that would make a killer combo C/Ku dish with the right gear fitted.
Edit: I did some digging in my "archives" and I was wrong (as usual!), BV DID list a 10' perf in their sales literature.
Magic, you may have the Holy Grail (in my book) of the 10' perfs!