Lee-Enfield NOS British Chargers with G M VI markings - Question

[Snowy Owl]

I just recently bought 12 Lee-Enfield Chargers that were described as NOS (from the 40's) British Chargers.

They look like unused Mk III Chargers (5 side holes) and the parkerizing is rather rough.

Markings : G M VI on one side.

Question : Anyone familiar with those British (really ?) Chargers and their unknown to me markings ?

TIA

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