Ordnance items in a frame

[Montagu]

This interesting item belongs to my work colleague. It says on the back that everything is inert.

Does anyone know if these were once sold in quantity or is it more likely to be a one-off? It would also be interesting to learn when this may have been put together, if anyone knows.

Thanks for looking!

 

[jonnyc]

Looks like a one-off collector-made item, but it is really nice. I guess it's definitely post-1957.
Too bad it has that hokey .303; would be much nicer with another Snider variation.