Always interesting to see these videos. They focus so much on WW1 experience.

As for the serial number I would say A5023. Think prefix A and 23 as last two numbers are easy to spot. First number has top heavy reflections on the receiver and a round bottom reflection on the butt slide with a round top reflection around the middle high of the whole number. Thats why I would guess a 5 or perhaps a 6 but 5 would match the receiver reflection better. The second number has a round bottom and round top reflection on the buttslide with a very even colored middle section. So I guess a 0. Would also match the receiver reflection.

Don't know if these number would even match with the produced double dovetail MK1 brens. That's not my expertise
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