The gun was made in 1966.
Could be inspector's mark.
Nobody knows this for sure.
No serial number = no way to answer.
Minor variations of the gun were issued with an A or B added to the end of the serial number. I don't think the exact differences are concretely documented, but the main thing is that the "B" was a particular revision of the overall design.
There was no B letter prefix assigned to the browning auto-5 shotgun serial number range.Please look again and list the complete serial number and any letters that appear before,during,and after the serial number.
That serial number requires a call to S&W
If you mean a serial number on some product, it depends on what the product is. Each company can makes serial numbers mean anything they want it too.
With the serial number that you have supplied,your Winchester model 52B was made in the year 1941.
Generally, it means nothing.
Frame
With the serial number that you have provided,your Hi standard Model B was made by Hi Standard in the year 1936.
It means that it is a duplicate serial number