That's an Accusump. It used to be the difference was that Canton's used a schraeder valve for a preload of airpressure behind the piston. IIRC Moroso's had a hemispherical end and that had to be pointed upward. Canton Accusmps's were raw finish for years.
Last edited by Mattax; 04/05/1801:38 AM. Reason: clarification and spelling