Willy, in the 30's turn signals were of no interest and uncommon, not required by law - don't know exactly when GM started offering them as an option, but they were available aftermarket early on - in the 40's they were used more, and by sometime in the late 50's many states required them so aftermarket units were added to many older trucks .... if the turn indicators were on the front, it would almost always have had 2 tail lights to accommodate the signals in the rear, although some front fender lights were 2 sided and would display to the rear as well
Bill
