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The "P" designates peep rear sight & ramp front sight, not sure of the "G" designation.
line up the target on the top of the front sight while sighting the front sight through the rear peep sight.
Savage 325c rear peep?
i would look to gunbroker.com,and look under gun parts/sights. E-bay may have one also. Numrich (GUNPARTSCORP) has some of the parts, but not the discs.
They had a Small round knurled peep sight
you do for a marlin or mossberg
Peep sight
To remove the rear sight of a Remington 742 rifle, first ensure the rifle is unloaded and safe to handle. Use a flathead screwdriver to carefully loosen the screws securing the rear sight to the receiver. Once the screws are removed, gently lift the sight off the mounting base. Be cautious not to damage the sight or the receiver during this process.
Crosman offers a service to locate repair shops that repair older Crosman airguns. See the link below
If everything is there including the rear Peep sight and it's in decent shape anywhere from $150.00 to $250.00. There is one at Gunbroker.com right now with an asking buy it now price of $300.00. I doubt that it will sell for that much but you never know.
Most came with a tooth ramped iron sight.But there could be different styles depending on the age of your Winchester model 1894 rifle,such as a peep sight,a full buckhorn sight,etc.