Need help to identify an Enfield No4 MKI

[Dampherb]

Hi. In the first place, sorry for my bad English.

Secondly,
Im looking to buy an Enfield model N04 MK1 as I fell in love with this firearm and this particular model. In my search for a weapon that is still in great shape, I came across one that let me perplex.
The owner claim that the weapon was made by Maltby and has all the original pieces, but the marking is quite strange. The link below lead to the ad in question and has a picture of the marking.

The link is safe, no worries to have.

Lee Enfield No4Mk1 Match Number Usagé Ã* vendre Ã* Saguenay (Chicoutimi) - LesPac.com Sport Saguenay (Chicoutimi)

What I find quite odd is the serial number starting with a ''G''. As I have read this mean this weapon has probably some manufacture errors or has exceed the 9999 serial.
There is no Maltby brand ''M'' but a B instead and the year seems to be 1940 or 49.

I find that the price is good for here in Canada and the condition but I don,t want to be tricked in buying a false Enfield or a MKIII hidden has a MKI.
So I came here to have some advices by people with more knowledges than me as for why I ask you what do you think ?

There is no pictures of the upper markings too, just a serial number : G1446 and a big B.
So, should I buy it or pass turn and wait for the next one?

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