Tags like this depended on where you were. Some states/cities/counties had laws/specification concerning gas pumps. Some locations required that the pump be inspected as to location/installation/electric etc., and some had requirements where a tag be attached to the pump that specified that it had been inspected and had passed the area's specifications.
Too many collectors assume that every pump made by a pump company was the same. In many of my parts manuals there is a section where they show the specification for New York City, or the state of Massachusetts, etc.
Did your pump come from Arizona, where in Arizona, etc.? Not looking for an answer, it doesn't matter. Apparently the tag that is missing was not put on the pump by Dayton.
Jack Sim
Author, 1st & 2nd editions of Gas Pump ID book, 3rd edition is now available at
www.gaspumpbible.comAir Meter ID book also available