No 4 rear sight with aperture milled off.

[mr.e moose]

I recently purchased a No 4 action that was stamped on the receiver ring, ALF. PARKER BIRM. Underneath that was a Crown, BNP and 19 Tons. Butt socket was stamped with serial 1728?. Why would it have a Mk 1 rear sight with the rear battle sight milled off? Sight is stamped with a B in a diamond.
Thanks in advance for any information you can provide.

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