No doubt just an old tractor or impliment light. Probably worth in the $5-$10 range. I've had pairs of decent looking Tract-o-lites fetch $25 plus shipping tops.
These r the tractor blinkers on the old Daytripper... I think they were $25-$35 for the pair (upper), lowers are of unknown origin & were really cheap!
Tractor parts are great for Rods. They are still fairly inexpesive and easy to find. Here's a couple of grilles and a gas tank I have for future projects.