I don't know what that stamp is, need a serial no if it's made after 1921 it will have a
date code stamp on the left side of the barrel next to the receiver. I've added a related link with a pointer to the page on the Remington Society of America.
It's date code stamped on the barrel, see related links for information on the Remington Society of America.
Check the date code stamped on the barrel. Look for the manufactured date link on the Remington Society of America for details.
Since 1921 Remington has date stamped the barrel you can find the details/table on the Remington Society of America under the Manufactured Date link.
The Remington Model 547 is in production.
It is unusual vs. rare
if it's 1921 or later the date code is stamped on the barrel, check the manufactured date link on the Remington Society of America. If it's before that need model and serial no.
You will have to ask Remington.
Remington's website does not show it as current or out of production.
1928, will be date code stamped. check link on Remington Society.
The last year of production for the Remington model nylon model 66 was 1990.These rifles were made from 1959-1990 with a total production of 1,050,336.
It was in production from 1931 to 1949, when it was superseded by the Remington 870.
1925 As such it will be date code stamped on the barrel. Further details here: http://www.remingtonsociety.com/rsa/questions/barrelcodes