Schermack Co., Type III, 1910/23 Issues (383/611) impressive group includes 383 mint strip of four, 384 used single with 12-hole control perfin, 482 mint strip of four, 484 mint guide line strip of four, 532 mint pair, 532 mint strip of four with 1989 PSE certificate, 533 used single, 534 mint guide line pair, 535 mint guide line strip of three, 575 mint pair, 576 mint pair and strip of four, 577 mint pair, and 611 mint strip of three, plus some lower-value items, all fine to very fine and selected for freshness, a choice group (Scott $850+)