No published history known.
February 1946
I bought mine on August 15, 1992 and at that time it was a state of the art unit and is still operating well.
It is the same as a springfield 511 of Springfield, Savage & Stevens
Means it was made in February 1942. See related links.
Google Remington scoremaster model 511. Several websites have information on this .22 firearm.
check the date code stamped on the barrel. Remington Society of America, Manufactured Date link has the details.
No published data
$225-$250
Try e-gunparts.com
its a 4 ton
I have a 511 puzzle that says made in Holland on the back with the date 1971-1972.
Brownell's Montezuma, Iowa for around $15