Hello,
I got a response from avia:
"I have been lying in our historical documents for a few hours, and unfortunately – we have no information to this concrete blade.
We found ca 200 logbooks of V20 props!
Some of the V20 props were sent to former AVIA Letnany for overhaul (usually after crash), but most of them were produced there as new. Going through those logbooks – the lowest blade set number I found is 725. It was produced in year 1956! Went back to Avia for overhaul in year 1960 – and it says it was installed on a YAK11. Prop after crash – so the blade set has been changed. I also found information about the last user – Svazarm – Brno Slatina. So this is just for an example – if it helps.
The highest blade set number might be: 1312 (year of production: 1959).
"Your blade" is elder than that – blade set number 222. I assume it could be produced between years 1953 – 1956… Who knows where these logbooks are – in museums? I have no clue.
I was very curious to find out - even though I am not a historian and it is not in my job descriptionJ
This is all I can do for you."
I guess this is where its end, to bad i cant find more info about it.