Your pump was probably made between 1949 and 1956. Without the original ID tag you will never be able to determine the date.

You mentioned this is your first date, if you intend to purchase more you should get a copy of my Gas Pump Identification book shown at:

www.petrocollect.com

Jack Sim

Author, 1st & 2nd editions of Gas Pump ID book, 3rd edition is now available at www.gaspumpbible.com
Air Meter ID book also available