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Savage Arms was created in 1894.
I would contact Savage arms on there web site for info on your savage model 487T.
savage arms company was located in chicopee falls mass. from 1946-1960.
Your Savage model 99E was made from 1960-1982 by Savage arms company.As to the exact year of production,you will have to contact Savage directly.
try: SAVAGE SHOTGUN.COM