Info on Dad's old Parker 20 ga VHE

[TimCayward]

Hello ~
My Dad bought a Parker 20 gauge VHE back in the 70's. It's been in my closet for about 25 years. I'd like to ask you guys for some information. I've done some research on it, but I understand that there is a Master Book of some sort that has information on each gun produced. Here's what I know:

Serial Number: 137173
Date manufactured: 1906 (1905 to 132,000; 1906 up to 138,300)
Length of barrels: 28"
Length of pull to front trigger: 14-1/8 "
Chambered for a 3" shell.
drop at comb: 1-3/8"
drop at heel: 2-1/2'
Weight: 6lbs 10oz
Frame Size: 0
The serial numbers on the barrels and the receiver match.
On the Vulcan Steel gun barrels' water table, there is a marking: 3 with a superscript 7. I would expect this to mean 3lbs 7oz. However, the weight of the barrels is about 3lbs 1oz. Does this mean the barrels were cut? The gun looks very original, but I'm no expert. Also, is there a factory choke on the barrels? I attached a couple of pictures. Thanks for your help!