Vintage dumper identification

[Duncanthedumper]

Hello, can anyone help me to identify my dumper, I have e-mailEd most of the major manufacturers and no one is laying claim to it.

I am beginning to suspect it’s a bit of a Frankenstein’s monster but it must have started life life as a particular model.

I’m interested in restoring it but I need to indenting it first, any help would be greatly appreciated.