Hello,
Value will depend to an extent on whether or not your Sterling is a Display only or a Cap Firing model.
Gyrene's is a Display model, i.e. ground bolt face, plugged barrel, no detonator pin so it cannot cycle or fire cartridges
A firing model will be more desireable.
It'd be good to see some photos if you could post them up please?
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Cerwyn
Hobby collector of Replica model guns and Militaria.
also member of Living History Reenactment Groups.