No 4 Receiver question

[BurtonP]

Hi all,
A quick question about a project I'm revisiting. Ages ago I posted this one that I'd restored as a faux 4T, and I'm finally getting round to the daunting task of mounting a real No 32 scope. Mr Laidler's essay on the subject has been printed for reference!



Anyway, I'm curious about the receiver wall in the pic. As has been commented on before it's a real dog's breakfast - a bad day for someone at the Fazakerly plant in 1942. What I'm curious about is the ground recess in the left receiver wall where a scope mount pad would go - is this what it is? There are no other marks indicating 4T selection; it's a normal ROF product FTR'd possibly at Maltby, possibly at Long Branch. The ground recess, if not original, certainly pre-dates thhat might it be?e FTR stamping.

What might it be?
Thanks in advance.
B

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