Letter 'K' on Persian Contract Luger Magazines

[rpbcps]

I recently bought a Persian Contract Luger, and although the magazine does not match, it does have a serial number in Farsi Script.
What puzzled me is the Farsi letter for 'K', which is under the serial number.

This arose my curiosity, so I checked my copy of 'The Borchardt & Luger Automatic Pistols', but could not find a reference to the Farsi letter 'K' on the magazines of the Persian contract Lugers.

So I did some research on the internet and found an example of the Persian Luger, listed as being sold, by Phoenix Investment Arms with all three original magazines.
All three magazines appear to have the Farsi letter for 'K', as well as two of them having the + symbol.

Does anyone know what is the significance of the Farsi letter 'K'?

The Luger has the Scriptic "S" on the 2nd toggle, which I believe is one of the proofs from the 1934 "K-Date" Luger, indicating these parts were proofed and then used in the commercial contract. So I was wondering if there was any link to the Farsi letter 'K's on the magazines.

Wishing you all a Merry Christmas,
Richard