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Marc S.T206 Southern Leaguers are worth about the same with Piedmont or Old Mill backs.
T206s with a Hindu back command a premium - although typically not the same premium as non-SL cards with a Hindu back.
There are an exceptionally rare few reported T206 Southern League cards with a brown Old Mill back that would command a huge premium. But a true brown and a faded black are two very different things altogether.
In summary - Old Mills do not command any price premium.