It wasn't clear to me either at first but I took the U, T, Z to refer to the cigarette factory in bold at the foot of the card. U is for Union (Ramona & Nilprincess backs), T for Turbacco (Turbacco & Nordmark) & Z for Zepter (Solo).
I have a Binder with the same back too. I wonder whether is there is an order to the back variations, eg is it based on location or date of release. FWIW most of the dozen or so "Ausland" & "Ostmark" I have are on the 2 narrow Ramon / Nilprincess variations.
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