Brian - I've bought a number of T206's from sellers in the UK but haven't noticed any particular grouping of backs. Off the top of my head I remember buying a couple of Sweet Cap 150 No.649 OP's from the seller rarecigarettecards last year.
In the ACC there is a set of non-sport cards with Sovereign backs that are grouped with the tobacco wars cards in the high T numbers. I have read where some people think these may have been distributed overseas but I haven't been able to confirm this. Here's the back of one.
These cards were produced when the Sovereign brand was owned by the Universal Tobacco Company. ATC bought the rights to the Sovereign brand in August 1904 when the Universal Tobacco Company was broken up and auctioned off by court order.
It would be interesting if proof was found of overseas distributions of T206's.