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could be. It's certainly not a combination of lugs/ fillet brazing you often see.
I suggest this Carpenter has been repaired with a new top, head and down tube - probably during or shortly after the war when lugs were in short supply. Note that the headset frame races are not set into the frame in the prewar style, but are external and chromed.
Even if I'm right about this, it's not a reason for rejecting the frame - it looks as though it's had a lot of use since the repair was done, so presumably it should work ok.
As to 'special order', I would guess that all Carpenter frames were made to order.
I wonder if the handlebar stem is seized in the steering tube. The vendor has thoughtfully stripped everything else - is he just being generous about the stem?
I really like the 30s frame as well,However looking at other 30s Clubman models - This one is different in that it has a fillet brazed Head tube.
Maybe this was a special order?