1c-3c 1918-20 Offset Issue (525-530, 536). Plate no. blocks of six, all but three are tops or bottoms, several Mint N.H., No. 527 appears Mint N.H. but with some possible strengthened perfs, two of No. 528 incl. one with "OAM" plate printer's initials (both Mint N.H., "OAM" block with large gum skip), No. 528A with "OAM" initials (slight internal crease and some perf seps), 528B Mint N.H., two of No. 529 incl. Mint N.H. side plate block of eight with plate no. shift, attractive and Fine-Very Fine group

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