Lee Enfield No.4 MkI 'Singer' Rear Sight and Fittings Early Savage Type

This is a MkI rear sight for the No.4 Lee Enfield. This is the so called 'Singer' sight with screw adjustment for elevation. This one is the scarce early Savage type with a small battlesight aperture as fitted to the 1941 Savage No.4 MkI although it has an 'F' marked slide. In perfect unused condition complete with plunger, plunger spring and pivot pin, no pivot locking pin. Very hard to find.
UK postage $2, Worldwide airmail shipping $6, Paypal only.