Yup, I've got an Old Mill Bell too - I pretty much don't think any possible front-back combination is necessarily tough (so long as it isn't a rare back to begin with) - it's just that most T206 collectors don't bother checking their cards.
In any case I've also got a couple that aren't listed on the super set spreadsheet yet - at least my copy:
John McGraw (Portrait w/ Cap) - Tolstoi
Heinie Wagner (Bat left sholder) - Sweet Cap 350 Fac 25
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