I don't do a whole lot with material in the "Battleship Era", but these two tougher blocks caught my eye and was able to get them at decent prices. I especially like the used block due to the cancels. Not a scarce cancel by any means, but the block makes for a nice presentation.
R183 mint full gum. A tougher block, cataloging $1,250.
R177, used block of 4 catalogs $700.