Well they should be worth a few dollars depending on conditon and size. Difficult to say without photos and the frames (if they are framed) might be worth as much as the litho.
George Buzza founded the Buzza greeting card Company in 1907. In 1928 it merged with the Charles S. Clark Company of New York City. the company continued in business until 1942 when it liquidated because of losses.
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best.............Ti m