is this stein pc buck weaver real?

[esd10]

http://www.ebay.com/itm/1912-BUCK-WEAVER-WHITE-SOX-MAX-STEIN-BASEBALL-POSTCARD-CHICAGO-BLACK-SOX-/150898202167?pt=US_Baseball&hash=item23223bd637 i had seen this buck weaver on ebay and on the back there is red printing that i have never seen befor in my searching

[Bicem]

yes, real. postcards often used as promotional tools by 2nd parties back in the day.