I had looked at PIK before, based on what looks like a Winter variometer, rather than a VSI, but I obviously didn't dig deep enough.
A PIK-11 Tumppu, OH-YMC to be precise:
Photos: PIK-11 Tumppu Aircraft Pictures | Airliners.net
What a nice looking little aircraft. Quite a Mustang feel to it, even more so in this silver example:
Photos: PIK-11 Tumppu Aircraft Pictures | Airliners.net