My house was built in early 1960s Ontario, Canada, and this shed may or may not be original to the house. I'm having trouble identifying what brand the shed is, and if there might be replacements available for it's door handles.

The local hardware store tells me that there are some makeshift solutions I can use, but ideally I find an exact replacement because this will allow me to more easily lock the shed. Here are a few pictures:

Does anyone know how I might go about identifying this shed, and finding a replacement handle? If not, do you know how I'd best go about replacing the handle with something else?