Mark, I agree with the posters above. The gun is definitely not Parker Brothers from Meriden, CT. It is a knock off of Parker Brothers. If the proof mark at the top right is of an E over LG then the gun is Belgian. For cleaning it may I suggest using some 0000 steel wool soaked with some light oil. Any good oil will work and it needn't be expensive. Rub the metal parts vigorously with the steel wool. You won't take off any good finish and will remove lots of gunk built up over the years. I would do this on all of the metal surfaces. They will end up still looking old but will be smoother by far. I would then get an appropriate bore brush and scrub the inside of the barrels to clean them. At this point I would put a thin coat of oil on the metal and inside the barrels and leave it alone. It is impossible to tell from here about the barrel wall thickness, length of chambers, what gauge it is etc. but I recommend not firing that gun. I hope this helps.
Dennis
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