100-10000 USD or more depending on specifics
Your browning superposed was made in 1933.
You will have to contact Browning.
With the serial number that you provided,your Browning superposed shotgun was made in Belguim for Browning in the year 1955.
Basically impossible to value with just the serial number.
Your browning superposed was made in 1968.
Your serial number of 15232 indicates that your Browning superposed shotgun was made in the year 1938.There were 1999 made that year starting with serial number 14,001 and ending with 16,000.
Receiver
With no other information; 100-10000 USD
100-1000 USD or more depending on specifics
The 72S suffix to your serial number indicates that your Browning superposed shotgun was manufactured in the year 1972,by FN of Belguim for Browning.
You will have to call Browning.
The browning superposed shotgun was first made in 1931.the serial number run began with the serial number 1 and ended with the serial number 2,000.