This would be a 12 ga. BPS (Hunter model) pump shotgun made in 1984
1988 = PP
The 2 letters NX in the middle of your Browning Invector pump action shotgun indicates that it was made in the year 1993.
Try the links below
That is a Browning BPS Hunter 12ga made in 1988. Value is going to be $250-$300.
Browning Pump Shotgun "BPS"
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.
Go to Browning's site click on support, then click date your firearm.
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
Made in 1997; 50-625 USD
In order to answer your question I would need to know if your shotgun is a auto-5,browning pump shotgun(BPS) or a over-under(CItori or superposed)to give you a accurate answer?
The "PZ152" is what matters in the serial #. "P" corresponds to an 8, "Z" corresponds to a 1, meaning this gun was made in '81. "152" means its the Hunter 12 gauge. http://www.browning.com/customerservice/dategun/detail.asp?id=25