The letter G prefix to your serial number indicates that your Marlin rifle was made in the year 1950.
If you mean serial number 27,078,977;then it was made in 1973.
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.
A marlin model 36 adl 3rd variation which should have a C or D prefix to the serial number is selling for between 450-550 dollars.If your rifle has a B prefix to the serial number,then it is a 2nd variation model 36 and is going for between 600-750 dollars in 90-95% condition.Which is what I would assume you mean by (mint).
It means that it is a duplicate serial number
It's part of the serial number.
You have a serial number of 00000 the letters NW mean your BPS was made in 1994.The B52 could be referring to the model number.
Regular Carbine.
This is the serial number. Each bill has a unique serial number that identifies it.
Could be a serial number or assembly number
645998
9700253
Serial number