29c Greetings, Vertical Pair, Imperforate Between (2872e). Mint N.H. blocks of 45 from the top and bottom halves of the pane of 100, each block contains 18 vertical pairs, imperforate between, plus nine stamps at top or bottom normal, including four plate no. blocks of four of the error, Very Fine, Datz states at least 40 error pairs are known, if his estimate is close to accurate then these blocks represent the vast majority of known examples, listed but unpriced in Scott

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