We have the above mentioned revolver . The name is listed on top of the barrel of the gun. We found some information that told us if it was on the top of the barrel, it was made between 1887-1889. We also found a serial number? under the hand grip #7002. Is this really the serial number and do we have the manufacture date correct--Iver Johnson Arms Co.--supposedly was the manufacture for that date. Also, it is in average condition for a gun of that age-what would it be worth?