The 552 is still made.
Remington Model 552 Speedmaster
Read the manual on: http://www.remington.com/products/firearms/rimfire/model-552/model-552-bdl-speedmaster.aspx
375 to 500 in good condition
Send me your email address. I'll send you a scan of the Rem. 552 owners manual. USDF
Production of the Remington Model 552 A, Speedmaster began in 1957 and was still being produced in 2006 as the 552 BDL Deluxe Fieldmaster NRA Edition.
1958 1988 mod 552
Check date code left side of barrel, then go to Remington Society of America to look up.
Yes, since 1957 and still going....
Manual located here - http://stevespages.com/pdf/remington_552.pdf