15c Dark Blue (259). Bottom imprint and plate no. 52 block of six, unused (no gum), intense shade and impression on bright paper, few perf separations sensibly reinforced, positions 1 and 2 with small thins, Fine-Very Fine appearance, scarce with such choice centering, a Power Search review found only five others (also from the bottom position) -- two have perfs either in or close, the centering of the plate block offered here is superior to almost all the others, and bidders may wish to overlook the lack of gum in order to obtain one with decent centering, with 2009 P.F. certificate, Scott value with gum

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