1934 Mosin Nagant 91/30.

It looks like you have a 1954 Mosin to me. It rare that you get a bayonet with matching serial numbers as they are not shipped with the rifle as a unit but in bulk. A crate of rifles and bundles of accessories. Here is a website for all things Mosin: http://7.62x54r.net/MosinID/MosinIDII.htm

PW Arms would be the importer but it seems funny to me that they engraved a different serial number than is stamped on the rifle.
Spend a few hours cleaning the cosmoline off your purchase and then go shoot it.

1934 Izhevsk 91/30, refurbished postwar. Matching numbers are normal for refurbs. Not unusual to get a matching bayonet as long if your dealer takes five seconds to get the right one out of the crate. The importers have their own serial number sequences so that's normal too. Looks like a nice example - enjoy.

So how do you know it is of 1934 manufacture when it is clearly stamped 1954 on the chamber?

Wow, my eyes see 1954 in the first photo you posted but clearly the last is 1934. I better give it up.

You've already got the basic info, and it looks like a nice example. The Cyrillic "P" (looks like a lower-case "n", in a circle) to the left of the serp i molot/sickle and hammer, simply stands for "probat" or "proved".

Just that the barrelled receiver was fired with an over-pressure proof cartridge, to make sure that it'll stand up to firing ordinary issue ammunition.

That is in very nice shape, and a hex shaped receiver. My 1943 Izzy Mosin round receiver had all matching serial numbers but not in as good of shape. Shoots wonderfully though. I have the same odd optical illusion with the date. I see 1954 in the first picture and 1934 in the other.

Your photos are not working well on my cellphone, but if you post them on gunboards.com they will help you out.

There are probably tens if not hundreds of thousands of Mosins that have been brought into the western market over the past 20 years or so. I don't think the value of either an original nor a modified Mosin is going to change other than the rate of inflation for the perceived future. One of my employees put an aftermarket synthetic stock on his and it completely changed the appearance but it was still just a 91/30. I corked the forearm of two of mine and feel that they shoot much better. If you wish to get a better appearance with the original wood I would strip and then use some linseed oil finish of some type to get a nice looking rifle. I would try to steam any dents out and use minimal sanding as the wood on a Mosin is not real robust anyway.