Pump (L-1) was first made by Erie.
Erie sold out to Neptune, Neptune made them.
Neptune became part of A.O. Smith, they made them.
A buckle from any of these three pumps will work.
BTW, all the pumps listed above were made the same place, in the original Erie factory building in Erie, PA.
Author, 1st & 2nd editions of Gas Pump ID book, 3rd edition is now available at www.gaspumpbible.com
Air Meter ID book also available