This issue has variants.
Code is K.K.G.A. #278-658.
Gaylord Du Bois script credit as per page 42, Gaylord Du Bois's Account Books, Sorted by Title, compiled from the original account books by Randall W. Scott. Script identification by David Porta (September 2013). Account Books entry states: "Lassie in the Fire Trap. 46 units. For March of Comics, 1965. Sent February 16, 1965."