1943 No. 4 Mk. 1 mystery rifle

[Texassmelly]

A couple of weeks ago I bought a No. 4 Mk. 1 . Beyond its basic designation I don't know what some of the markings mean. I found some of the markings' explanations on another site. If anyone knows what any of these markings mean, it would help a lot.

On the left side of the receiver it is stamped:

C.I.A. GEORGIA VT.
CAL. .303 ENGLAND
SER. MK415217
(the serial number might mean it is ROF Maltby, What does the CIA Georgia VT mean?)

On the band between the trigger and the bolt, left side, it is stamped:

(M topped with arrow pointing up)1943
A
15629

On the top of the receiver near to the wood handguard, it is stamped in small letters:

(crown)
N
55

On top of the metal piece directly behind the front sight, it is stamped: S.M.
(probably means Singer Manufacturing)

On top of the band directly behind that stamp, it is stamped: S126
(probably means C.E. Welstead, Croydon)

On the lower rear right side of the bolt, it is stamped: N 67 MK II
(probably means Singer Manufacturing Co. Ltd., Clydebank)
but what does the MK II mean?
On the forward end of the bolt there is a B overlaid on an L, which might mean the bolt is Long Branch.

On top of the front sight, right side, it is stamped: 015

The rear sight is the flip 300-600 peep sight. No holes drilled anywhere for a scope.

No unit disc on the buttstock. Four grooves on each side of the upper handguard. Nothing on the potmetal buttplate, nothing inside the buttstock storage except a couple of 'original cleaning rags'. ;-)

What have I got? A mishmash of parts, or something interesting?

I'll not do any shooting with it until I know more about it and after a gunsmith checks the headspace and general condition. To me, the bore looks fairly clean. The wood looks good, very few dings.

Any help on identifying these marks would be much appreciated. I looked through this fine forum and didn't see anything useful.

Merry Christmas and Happy New Year!

-- Texassmelly

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