A large painted tool box.
I bought it from someone who purchased it 40 years ago from Allen's Antiques - he dealt in the Niagara Pennisula for many years. His tag says the tool box is from the last horse drawn fire wagon in the Niagara Falls Fire Department. It is similar to the tractor boxes that one frequently sees but larger and finer in painting.
The catch to close it appears to be a later addition.