You will need to call Browning.
1972
It means that your gun was built in 1997 in Japan.
1950 sn range 285001-315000 per Browning's web site.
The 2 letters found in the middle of your serial number indicate that your Browning hi-power was made in the year 2001.
It was built in 1969 in Belgium. It should be a 12ga. Magnum.
The serial number L52789 indicates that you have a Browning light weight model,auto-5 shotgun which was made in the year 1955.
You will have to call Browning.
100-1000 USD or so depending on specifics. You will have to call Browning to find out when made.
made in 1965 Date your gun http://www.browning.com/customerservice/dategun/index.asp
The Browning was built in 1968 on a long extractor FN Mauser action. The Leupold scope was built prior to 1974.
You can go to the browning home page and they have a spot where you can research your browning lever rifle(BLR). 32516 is the production number , K means BLR and 72 is the year of manufacture. Mine says 27290K71. It's not clear on the browning website but I've confirmed mine and yours is in the same style. And congrats, yours was also built in Belgium, not Japan as later ones are.