Unmounted blade ID needed

[Shakethetrees]

This just turned up in a warehouse cleanup, along with three other similar examples.

I don't think it was ever mounted.

The surfaces show signs of hand finishing and file work.

Not being sure of the origin, I was wondering if these blades could have been made in Britain for export? There's a certain business-likequality and consistency I see in them that leads me to this.

Not marked.

Double edged with a spur to one edge.