50-100 USD
Essex was a "store brand" gun made for Belknap Hardware by at least 3 companies, most commonly Crescent. In very good condition would be worth about $125. There is no special collector's values to these, just a nice older .22 rifle.
In the year 1890,as a model No.4 rolling block rifle.
There is no one rolling block rifle, and no one answer. Most are held on pins that must be pushed out with a pin punch.
10-100 usd
Depends a lot on which one and original condition, condition, and condition!
In order to determine the exact value of a Remington Rolling Block rifle, a few different factors would need to be taken into consideration. Some of these things would be the age and condition of the rifle.
I saw one recently at a gun show, they can range in price from 300 to 500 dollars.
Features and markings.
Which model?
5-75 or so
50-100 USD
Civil War was 1861-65; obviously, the Remington rolling block came out later. Is it a military rifle? What caliber? What condition? All these things affect value. Ranges of rolling blocks are from $550-$4000.