Look on the frame
The serial number.
100-500 USD or so
With what you have provided, only that it is a 9mm
100-450 US dollars depending on EXACTLY what you have.
Beretta USA calls themselves the one stop shop. They carry just about any firearm you could possibly want. You will also find all the accessories you will need to go along with your Beretta 9mm.
browning used the last two digits of the year before the serial number on the 9mm from 1970 until 1976 so your 9mm was made in 1973
Exactly how is the pistol marked? 9mm browning serial number 72C44338
There is no such thing as a "9mm Beretta" cartridge. Beretta firearms were manufactured in 9x19mm (also known as 9mm Parabellum or 9mm Luger), 9x17 (also known as the .380 ACP), and some models are made in 9x21 IMI for countries which prohibit civilians from owning firearms chambered in military calibres. The cartridge appropriate for your Beretta 9mm should be marked on the frame and slide.
Frame
You will have to call S&W to find out.
Contact Beretta.
Can't be answered without the serial number.