New italic Zippo logo and "Yearly Identification Codes" (dots)
		Zippo slim lighter advertisement for modern mothers ...
		1956 and 1957 bottom ("PAT.PEND" was eliminated.)
		"PAT. 2517191" was moved to beneth the Zippo logo.
		Humped cam spring and straight cam spring
		Engravings on the insert were placed vertically.
		Hollow brass flint wheel rivet and solid rivet
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