As the serial number indicates, your pump was born in July, 1950.

Here is some pictures and information on your pump: http://petrolianacollectibles.com/tokheim%2039l-ra.htm

Be sure to click on the pictures for a larger view.

Jack Sim
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Author, Gas Pump Identfication books 1st & 2nd Editions & Air Meter Identification books
We rebuild ECO air meters and sell parts.