Does anyone know what a BSA AIRSPORTER MK1, .177, serial number EB112 would be worth, reasonable condition?
It might depend on what you term reasonable condition.
I have seen airguns said to be in reasonable condition that I would rate as poor.
Putting up some pictures would help in offering an estimate.
In the UK .177 Mk1's aka Airsporter 'Club' model can fetch good money especially if in good condition.