Is there any other way (data base of Model 581s, by the serial number, etc.) that the month can be determined? Also, do the other symbols provide any information - or are they just inspection/proof marks? Thanks in advance.The Archivist Remington Typewriter Serial Numbers Remington Typewriter Serial Numbers for all Remington typewriter models. The symbol that I cannot read may indicate July (if it is an O) or September (if it is a D). I am guessing that the T indicates the year 1970. On the right side of the barrel is REP in a lozenge shape (this corresponds to the proof mark shown in the barrel code location diagram on this site), followed by an F, and a symbol that looks like an Egyptian Ankh laying on its side. On the left side of the barrel is 48, followed by a symbol that could be a D or an O (too poorly stamped to tell), T, and 71. I was curious as to the actual date of manufacture, so I looked at the barrel. 22 model 581 rifle that I purchased new in May of 1972. I just found out about the month/year codes on Remington rifles on this site.