I am the author of the Gas Pump Identification book, but I admit I do not have anything on the Butler 42. I do have some info on the 41, but again nothing on the 42.
Most of my information on Butler items is shown on this page of my website, is any of these the 42?
http://petrolianacollectibles.com/lit-butler.htmI hope the 3rd edition of my book will be out soon, and if there is any chance you could supply me with a picture of your pump I would like to include it in the next book. I will acknowledge your contribution.
I have found very little info on the Butler company and it is a shame that those that do have some info don't want to let others see it.
Jack Sim