Your posted block Deprotinator was a bonus addition as an afterthought in the Siegel lot referenced by rodgcam.
Siegel Sale 1145 (12-14-2016) Lot 743
Quote:
28c 1984 Summer Olympics, Block of Four, Imperforate Vertically (C104b). Mint N.H., vivid colors, Very Fine, an extremely rare perforation error, Datz states only 2 blocks known, accompanied by normal plate block with imperforate bottom margin
