Parker Hammer Gun Identification

[coleivanoff]

Hi all,

My father recently gave me a Parker Bros shotgun in 12 Gauge, but I need some help identifying whether these are factory barrels (measures at just about 18.5 inches) and what it may be worth as well as its year of production. I believe this is a dollar grade due to its serial number (6391) I have attached 5 photos for reference, please reach out if I can send more.

Here are the key specs and info I've found thus far:

-14" Length of Pull
-Walnut stock and forend
-2 Hammers and 2 triggers
-Top rib reads, "Parker Bros Makers Meriden Conn Stub Twist"
-Barrels appear to be twisted steel
-Some color-case hardening remains on the receiver, but is still very present on the inside of the forend
-Forend reads, "PATD MAR 26 1878"
-Receiver reads, "Parker Bros" on both sides
-Underneath receiver reads, "PATD NOV 13 1866" & "MAR 23 1875"
-Underneath barrels marked "2" and also marked "T2" (I understand this means #2 frame size)
-Possible 1875 manufacture, serial ranging from 4260-6748 (according to The Parker Gun: Identification & Serialization)
-Possible 1866-1868 manufacture according to TPG by Baer Beinfeld
-Twist steel is one of 1983 according to TPG: IS
-It appears that these models came in 30-inch barrels, so curious why mine is 18.5-inches


I've used two sources to find this info so far Parker Gun: Identification & Serialization as well as The Parker Gun by Baer Beinfeld

Any and all help here would be greatly appreciated, would love to know what I inhereted! Also, if this post is not allowed please let me know and I will remove. Thanks - Cole