Electro penciled or stamped markings generally don't just wear off.
I've seen markings removed during a refurb but they are generally replaced.
I do see a broad arrow but no other markings at all, seems strange.
There should be markings identifying it as being made by Fazakerley or BSA the only makers of No5's.
Every part of my 1945 Fazakerley has a marking or number or both on it.
I'm just hoping you didn't end up with one of those Khyber Pass knockoffs that are dangerous to shoot.
You really need to go over that rifle very very carefully with a magnifying glass to try and find any hidden markings before you put money into it.
Look for all the genuine No5 traits, fluted chamber, hollowed bolt handle, removed action lug on the right side behind chamber,
trigger guard figure 8 shaped by the front screw, hollowed out sear ect. None of your pics show any of any of these id factors. - Bill