The postcard is from 1907 or 1908. It's a "divided back" postcard (line down the middle for the address on one side and text on the other), which started in March of 1907. New 1c stamp designs were released in Dec 1908. There's always the possibility that an older stamp was used later than Dec, but I'd date the postcard in that 21 month window, Mar 07 to Dec 08.
|