Unit disks, when are they correct?

[BVZ24]

Working on a 1924 SMLE V restoration and I'm wondering about the unit disks. The original short butt stock was damaged beyond good looking repair. I recently found a NOS walnut EFD normal length butt stock of unknown date that is a spot on color, ageing, and wear match to the rest of the wood. The only difference to this stock and the original, is that the original had a unit disk, and my replacement does not. I can cut a unit disk pocket, and have done it before on newly produced stocks, but given this replacement stock is original, I don't want to ruin it. The unit disk has Farsi markings, and was definitely on the short stock for while.
How common was the unit disk on SMLE V, and is it more correct with or without it?

Information

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[Terrylee]

My Mk V appears to be fully original and has a butt-disc. Unmarked.

[BigBadDog]

Bearing in mind the Mk V was never officially issued (various un verified accounts that some may have been pressed into service post Dunkirk) as a service rifle probably unlikely to have unit markings.

One of mine has no markings and the other has a number, possibly a rack number, but neither have unit markings. IIRC unit marking ceased long before the Mk V was ever produced.

[browningautorifle]

Farsi markings

Probably amongst the weapons sent in emergency response to a foreign power. We HAVE seen documentation to that effect...

[Surpmil]

Bearing in mind the Mk V was never officially issued (various un verified accounts that some may have been pressed into service post Dunkirk) as a service rifle probably unlikely to have unit markings.

One of mine has no markings and the other has a number, possibly a rack number, but neither have unit markings. IIRC unit marking ceased long before the Mk V was ever produced.

How much is known about where they ended up? We've seen photos of one in Viet Cong hands of all places; something found in Malaya by the Japanese perhaps?

[BVZ24]

Another note, this rifle is in very good original numbers matching condition except for the more recently damaged butt stock and missing bolt. Not what one would expect to see from Iran. It's also BNP marked, but has no import or "made in Britain" stamp.