The eagle eyed amongst would have seen that I posted X-6 and then deleted it
G'day Martin! See, as I said earlier, always stick with your gut instinct!
Actually X-6 was a project name, and not the aircraft designation
I had a quick look at an old copy of Miller's X-planes and found this line drawing titled B-60, but it came under the X-6 entry, so I simply posted that.
By the way, is yours a Hatz?
Nope. Sorry. Here's a photographic clue...