More pictures of engraving.

Looks like a nice old shooter, in decent condition. Looks like someone put some shellac on the wood, but that's no big deal. I guessing the bores can't be too bad based on the rest of the gun. Maybe there's a Parker guy near you who could look at it, or a local double gunsmith. I shoot 3/4 and 7/8 oz reloads thru mine.

Dad shellacked the stock when I was young.
I tried to get a picture of the bores but was not able to.

If I had a borescope I would try to get some pictures of the corrosion pits.

Photos of pitting would not tell us anything. If you are looking to determine the severity of pitting, you need to measure the barrels with the proper equipment.

How would I do that?
I wonder if there is a gunsmith in my area who can do this?

Franklin,
I have it's sister, my PH 16 0 frame is my favorite mudbat/grouse gun! Many of the old guns we shoot have some pitting in the bores. An inspection by someone knowledgeable about barrel condition and perhaps a bore cam looksee is in order.

I own it's older step sister ser#66×××. Barrels cut to 26.25 in, pitted, and some very unusual "fix" to the grip. Love the wood however. Also a PH 16 Twist

16 ga
 

Franklin what part of Tennessee are you from? I am in Franklin Tn and have all the equipment to inspect your barrels and would be glad to help.

Kingston.
That is very neighborly! Thank you. Hopefully we can arrange a day for me to come over sometime this spring or summer. 😃