Japanese Browning SN's should have two Roman letters (A, B, C, etc) embedded in the SN, designating the year - have you removed the forend/barrels & checked for a full SN on the barrel bottoms and/or action interior ? It's the Browning Citori White Lightning built by Miroku of Japan.
Currently, a new custom shop B-25 starts at around K and goes as high as K. here is a faux B-25 Superposed that is currently available from Browning.
The serial number, according to browning, means that it was made sometime between 19.
The 153 denotes the Hunting model Grade l with a 3" chamber. \n These were versions of the Winchester 101 as made for Sears.
I shoot at my club a little and hunt a lot if ya know what I mean.
I see lots of descriptions for this gun, and the owners are giving specific years for which their gun was made prior to 1939 (i.e.
Actually, the Nomad was introduced along with the Challenger and Medalist in 1962.
Your pistol was made in 1966 which is denoted by the 6 after the p in the serial number.
Originally, the Citori Over/Under was an economical choice over the high quality Superposed Models.
Since it's introduction in 1973, the Citoris have been made in over a hundred variations.