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Wojtek, I disagree with your last statement. Check one example here. WNr. is 412122.Nice Steph !
However I'm not sure about the tall tail. All Finnish G-6s with the numbers 41* - 420 seem to have the standard tail.
Wojtek, my assumption is based on the original Werknummer, not on the Finnish serials. The example I gave 412122 is an earlier Werknummer (before 412131) and has the tall tail. Since the Werknummer shows (pretty much) the order of manufacturing/production, an a/c with a WNr only 9 positions after the one on the photo could be exactly the same. I might check more photos and look for a/c from the same block (from all nations) as a proof. The Finnish serials do not follow the original WNr.