Webley oil can

[Farsight]

I think your suggestion of it being a re-labelled 'Singer' oil can could well be correct, Chris, as I have a similar 'Singer' can on the shelf.

As for it possibly being a one off prototype, I very much doubt that as the 'Webley' on the top is wrong, being curved on the top edge of the logo instead of the bottom edge.
It's a pity there is no rear view.

I believe the full stop after the W&S should not be there either.. Still, five out of ten for effort and twelve lace- holes for trying it on !