Originally Posted by F.Bacchus

Taken from the "useless bike trivia" thread, the Union Cycle Co first patented left hand pedal threads in 1893 and the Wright brothers followed suit in 1900. So depending on the exact age and who manufactured the bike the left may be reverse threaded, though it's really hard to say because the bike is nearly exactly as old as reverse left pedal threading and who knows how quickly that standard was adopted.
T-mar was the one who posted about all this in the bike trivia thread so hopefully he sees this thread and can elaborate.