These were a standard export product from Kynoch for the many countries that used the .303 inch Vickers and Lewis guns in their aircraft.
These were certainly supplied to Estonia and Latvia who were re-equipped with British aircraft and weapons after WWI. The lot that came into the UK a few years ago came from the Baltic countries.
They were also supplied to Norway. The smoke tracer was the equivalent of the Buckingham Mark II with the spitzer bullet. My example is headstamped "K 27 VIIB". It is interesting that despite being nitro-cellulose loaded and Air Service, the headstamp includes neirther the full four digit date nor the "Z". Perhaps this is because those are strictly speaking British military requirements. Also, why is the ball box red? It should be buff and the tracer box red.
Regards
TonyE
I cannot recall whether I have seen a flame tracer box or not, I certainly do not have one. However, they must exist as I have rounds headstamped "K 31 VIIG" and "K 38 VIIG", plus the Kynoch drawings for them, and these are export headstamps.
Tony - That is a possibility, but then why the normal colours of green for AP and blue for incendiary. That was all "Red Label" as well.
I have labels for .5D that are buff for ball and then appropriately coloured for the other loads. I know that it is not "Red Label", but if that was their normal practice to do otherwise for the .303 is confusing.
Regards
TonyE