Top lever locked
 

When disassembling barrels from the receiver, the top lever is in a off-set position (approximately 45 degrees to center.) Should I try to re-install the barrel to correct this?

When you take the barrels off the lever will stay to the right. When you reinstall them, it will come back to center and lock them on. If you want to center the lever while the bbls are off, take a pencil or something else soft...NOT METAL.... and push it down into the slot between the tables, right up against the breech faces, and push down on the small square metal piece that you can see sticking out down at the bottom. Hold the lever over to the right a bit when you do this. That metal tab will depress down a bit and allow you to let the lever come to center. This is desirable to take the tension off the lever return spring and helps in putting the gun into cases. In some soft cases leaving the lever to the right will have it catching on the lining as you pull it out. If you leave the lever to the right it will hit the bottom of trunk cases, which you don't want. I always neutralize mine when storing them broken down. I hope I've made this clear enough. The little metal tab you're looking for is only about 1/4" in size and is down at the bottom in the table slot, right against the floor plate. Just don't push down on it with anything metal to prevent marring it.

Thak you for your help! I'll try that and let you know how it works.

Estimated value
 

It is a Parker shotgun manufactured in 1917 (9964 were made)
Frame size #1 Grade 3 Titanic Steel
Automatic ejectors, cloth and leather case
Sight beads on barrel and bluing in good condition
Can anyone recommend an appraiser in the Boston area, or can you give me an idea of the value?

Jim: Can you post in-focus pics with some close ups as well?
Cheers,
Jack

Please see attached photos

Looks to of worked, Nice gun too

Kind of lost this one for a while. Did anyone come up with someone in Boston to assist? What gauge? Serial Number would help to determine original barrel length (if the number is in the book) I can't make out the number from the picture. Are the bores pitted?
Jack