Re the discrepancy with serial numbers and ages.... it could be an honest mistake on the seller's part, or some other mistake... Or there's something off in the info online??
Ask the seller directly, not in an accusatory way just more like "I saw this info online and I wanted to double check about your piano..."
Separate from that... If the other possible Petrof buyer is a dealer, they can wait.
Back to your original question: I do not envy you! I owned a Petrof upright for a while and it was a really nice piano, with a tone unlike the other uprights I've owned.
Which, as it happens, includes a Yamaha U1. My Yamaha U1 was an amazing piano, the action was perfect, and over the 9 years that I owned it, its sound got better and better (I sold it because we moved internationally, and they wouldn't let me include the piano in my carry-on luggage allowance).
I also loved my Petrof. But my Yamaha was by far a better piano in every way. If I were given the choice of one or the other, I would choose my Yamaha every time.
Having said that, my Petrof was made around 1990, so a good bit older than the one you're considering. Oh and it was a 115.
Back to the Yamaha.... it is older, but both pianos are used so there's not a clear answer here....
If I were you, I would not purchase either piano without having them evaluated by a piano tech under
your employ. It would be ideal if you could have the same tech evaluate both pianos, but the Petrof seller may not wait for that?
Hmm, I may not be helping you with this post so I'll stop here...
