No published sn data I know of
The letters NZ in the serial number indicate that your Miroku made Browning was made in the year 1991.
In about 1973 the Browning Pump Shotgun (BPS) began production at the Miroku factory, and in 1976 production of the legendary John M. Browning-designed Auto-5 shotgun made the move from Belgium factories to Miroku, in Japan. The others followed as they were introduced
Around about 1984
No published sn data.
The 2 letters RR in the serial number indicate that your Browning auto-5 magnum shotgun was made in the year 1977.Being that your Browning was made in the year 1977,it was manufactured by Miroku of Japan.this began in the year 1976.
The Browning light weight 12 gauge shotgun was made by FN for browning from 1947-1976.These shotguns were also made by Miroku of Japan from 1976-1998.If you would supply a serial number to your browning shotgun then I would be able to identify the exact year of production.
Your MK 38 was made in the year 2009.
Your serial number prefix letters of RN indicate that your Browning 16 gauge shotgun was made in the year 1979.This would indicate that your shotgun was made by Miroku of Japan.All browning shotguns made after 1976 were made by this firm for Browning.All 16 gauge Browning shotguns chambered in 16 gauge were made before 1977.It sounds to me that you could have a shotgun made by Miroku of japan,and possibly have a Earlier Made barrel installed on your shotgun.A standard weight auto-5 shotgun will bring between 325-375 dollars in the condition that you describe,and deduct 30% for the poly choke barrel.
100-1000 USD
If you have a Browning auto-5 shotgun in 12 gauge it was made in the year 1925.If it is a 16 gauge shotgun,then it was made in the year 1929.
These high grade shotguns were made in Japan by Miroku in the year 1993.There were only 850 made.
The firm B.C. Miroku of Tokyo, Japan made the Charles Daly name of over and under shotguns from 1963 to 1976. Not a lot is known about this firearm, as retaining data apparently was not thought important when they were being sold. This shotgun has a value of around $700.