I'm assuming that you are referring to the Remington Model Eleven? (11) shotgun? That anchor stamp is most likely that of an inspector who was issued that stamp symbol and stamped the barrel after it was "proofed", which means that it survived a higher pressure load than what would normally be used for hunting, etc.
They have date code stamps on the barrel which can be looked up on the manufacture date link on the Remington Society of America.
11 - 48 slug barrel
from $100 to $400 depending on condition and barrel.
i assume you mean gauge it depends on what you have Remington 870 is made in several different gauges it says what gauge you have on the top or side of the barrel
Steel or Damascus barrels?
It doesn't look like there are much out there.
Remington Society of America, there is a link for manufacture dates link which will explain the date codes.
They are date code stamped on the barrel, see related links for information on the Remington Society of America.
From the date code stamped on the barrel. Look for the manufactured date link on the Remington Society of America for details.
depending on the condition 100.00 to 250.00.
Do a search on barrel codes, I believe that will give you an answer
1930-1933 (barrel is code stamped w/ date) Remington Society of America: http://remingtonsociety.com/rsa/questions/barrelcodes