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@edscoble
I reckon you're right, the 531 come in different thickness.
The missus frame is 26.8 and is double butted, but my Holdsworth is 26.6 of which is plain gauge (I notice this by sticking a long stick inside the seat tube and felt the ridge where the butted section end).
AFAIK 27.2 is just butted.
Quite hard to tell, this is as far as I gather.