National was bought out by Tokheim in the 1940s. Instead of coming up with a new pump, Tokheim decided to just offer the Tall and short Tokheim 39 with the curved glass panels at the top of the pump.
What you have found is a National 62/64/62A/62B pump. If you are looking for pictures of these pumps just go to my website:
http://petrolianacollectibles.com/national%20pumps.htmThis should help you with what your have found.
My new 3rd edition of the Gas Pump Identification book should be available soon, if you want your name added to the list of those wanting a copy of the book, just send me a email at: jhsim@petrocollect.com.
Jack Sim