The top pin is the official white on blue primary pin, handed out with "RFK '68" campaign literature.  It measures 1-3/8", with the union bug in white lettering on the edge.  The opposite side of the pinback shows very little corrosion; while the front shows some scratchin

The bottom button was  unofficial, and was released after RFK was assassinated in June 1968.  The 1-1/2" button is black and white on black, and there is an imprint on the opposite side of the pinback which may be a union bug.  The opposite side shows very little corrosion, and the front has only minor scratches.

An unusual set of RFK 1968 pinbacks, the latter of which I have not seen in over 40 years.

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