[HGabor]

I can just confirm the AC type they flew in the area:

- с-a Михаил Лаврентьевич Патраков (812 IAP) was shot down in Yak-1b, S/N: 23120, tactical white "23", engine: 4-2865 on May 2, 1943.
- мл.л-т Куреев Юрий Михайлович (812 IAP) was shot down and killed in another Yak-1b (S/N: 45138, tactical white "45") on April 12, 1944.

So the 812 IAP still used the Yak-1b fighters on March 14, 1944. Looks like they used the "Plane-in-batch" numbers for their tactical markings, eg. the 23rd plane of the 120th batch (S/N: 23120) was marked white "23", the 45th plane of batch №138 was white "45" (S/N: 45138), etc. So plane serial numbers reveal the applied tactical numbers of the 812th IAP for that time period.
Later the 812th regiment switched for Yak-9, eg:

- п.п-к Попов Иван Феоктистович (KIFA) in his Yak-9TD (S/N: 1315312, ВК-105 ПФ engine № 415-1182) on December 11, 1944 in Poland.

Gabor