Don't have 121 serial list, check date code stamped on barrel. See related links.
I don't know about the Super Deluxe name however they do exist. I currently own a black stocked version with white diamonds. The receiver is chrome plated and the barrel is nickel. I checked the serial number (2311XXX) a while back and believe it is mid 1960's production. Wikipedia indicated the nickel version was Brazilian but mine is stamped Remington. Other barrel markings are "BY", "REP" in parenthesis, what looks like an iron cross and and the number 70. Buttstock is also marked Remington USA.
My Remington 81 ser#162xx was manufactured 07/1941 There should be a two letter code on the barrel. you can cross reference the two letter code to a production date on Remingtons website.
What advantages did the Romans find in using a cross vault instead of a barrel vault?
Cross vault
Early S&W revolvers (up until sometime in the 1970's, I believe) had a cross pin through the barrel just forward of the forcing cone to prevent the barrel from unscrewing. The cross pin was deleted from the design as not needed.
check the serial number.
A barrel roof is a roof with a curved, semi-circular cross section, used to span large distances, such as found in railway stations and churches.
Cross vaults are in reality just two barrel vaults that intersect at 90 degree angles. These vaults are found to be more stable and the buildings were more sound because of them.
A vault formed by the intersection at right angles of two barrel vaults.cross vault
A barrel vault is a simple roof with a curved, semi-circular cross section, used to span large distances, such as found in railway stations and churches.
A barrel vault is a simple roof with a curved, semi-circular cross section, used to span large distances, such as found in railway stations and churches.
After the bolt carrier is removed, the pin is driven straight down to remove.