Theo has done his research well. The rarity scale on Ted's site is interesting and allows for some flexibility- it hasn't been updated in years but is good to use as a general rule of thumb.
As for the P-26, the Finn who espoused relining the bores based on the Salerno method was ridiculed at the time by his competitor who was as spiteful as they come. It wasn't until later on that he was vindicated as the liners were sturdy, held up well, and performed the task they were intended to perform. You can find rifles stamped P-25, P-26, and P-27. I believe there has been a few, literally, that have been spotted in the wild stamped P-24 but they are extremely rare. As for value, I would say $300 would be a good beginning asking price and values can fluctuate greatly. Gunbroker values for the P series of rifles have gone from $300 to $500 on average; anything over is a bonus big time. $300-$400 is about right.
The other one (please don't ask me to twist my fingers and get cramps typing Finn) is a very nice Tikka M-91. The Puolustuslaitos stamped one (ah, my fingers!) gets extra brownie points solely due to the stamp. I own about 70 Finn Mosins and not one of them is stamped thusly. One of these days- they're out there, I just haven't been hot to have one otherwise I would already have one. The value of a Tikka M-91 without that stamp would be around the $200-$300 range. With the stamp you're probably looking at $250-$350 range $400 being a great day for the seller.
Having said all that, Theo, if you EVER decide to sell the Tikka you WILL be calling me first, right buddy? Right?
Regards,
Eric