When was Remington 3200 made with serial no47218?

1932-1944

The Remington model 32 was made between 1932- 1942 approximately 5100 of the guns were made, so the 40,000 serial number doesnt fit.

The 3200's were made from 1973-1983 and with your 40,000+ number that would put you somewhere closer to 1978 ish.