The picture is a little fuzzy, but they appear to have bullet style male connectors with cloth covered wires, which Ford used.
They look like aftermarket horns. Something to make your car sound like a train or a semi. Are they car related? Well I probably would not put them on my bike but I would put them on an old truck or car.
They may be off of a 37 Ford. I was looking at some leftover 37 parts today at a friends garage and he had a pair like those. He said they were 37 and were pretty hard to find. I would post it over on the Ford Barn.
Price.. I paid like $40 for mine cuz I thought they was cool as hell. I seen some relays on fleebay 6V seller stated 36-49, I believe mine are 12v tho..and from the 50's? Not much on the interweb that I could find..
Update, the seller decided to give the horn to me seeing its missing the relays and the horn screens.