Marked "(C) WHITMAN PUBLISHING CO.", "holgate", and "PRINTED IN U.S.A." on both bottom edges. Marked with a black "2" in marker on the edge of all pieces. This was apparently to distinguish them from those of Unknown two-sided frameless Holgate puzzle, bird family/bunny family , which it was purchased with.
See: "'Teach-A-Tot Tot' Toys by holgate", catalog.