Thanks Tom,
Looking at Baudino's photo, I feel quite confident that the placement and style of the serial #s on mine and the example in the photo are a decent enough match to prove provenance. Since the 1923 Finnish purchase of LP08 stocks was for 5000 units, Mine having a serial # 4521 would definitely put it into this block if the Finn's numbered them sequentially. If the serial # were greater than 5000, I would quietly fade away.
Thanks Jerry,
Here's a pic of a screw that I just took out, seems to have the correct design you mentioned.
With these 2 new pieces of info, along with Baudino's archive photo, I feel confident that this stock WAS part of the 1923 Finnish purchase. As a result, it seems this stock should be of special interest to Finnish collectors as a niche item. I do recall seeing photos posted on this Forum showing Finnish soldiers firing 4" P08s with stocks attached.