Re: Bf 109 identity
Olivier,
I don't know any dates. According to Valtonen (he refers some sort of LW memo) it was planned to switch to higher CR after a small serie of lower CR engines but in reality there certainly was quite large number of low CR engines (the Finnish air force AS planes with lower CR engines were delivered summer 1944). Most probably there were several versions of AS engines (high and low CR etc.) in production same time depending on manufacturer.
Generally it's difficult find exact documentation on these because there is quite a lot confusing documentation. So in practice pictorial evidence seem to give most reliable view.
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