How old is your Belgium Browning 12 GA A5 Magnum serial 49337?

First lets start with the fact that the Browning auto-5 Magnum was made from 1958-1976 in Belgium.After Words the Auto-5 magnum was made by Miroku of Japan for Browning from 1976-1995.If your shotgun was made in Belgium,it should have a suffix to the serial number of 8V or 9V etc.If your shotgun nwas made in Japan then it should have a 2 letter code in the serial number sequence.It may be that if you do not have either then you do not have a Magnum version of the auto-5 shotgun.Please re-check your serial number and info on the receiver and repost your question to get the correct year of production.