advanced collection with detailed plating and annotations for nearly each stamp, many overprint color varieties noted, CZSG-listed overprint varieties are too numerous to list comprehensively but we note (mostly mint): 9.3 ("E" of "Zone" faintly printed), 9.5 ("Zone" shifted to left), 11.1 ("Panawa" at right), 11.2 (left "Panama" 16mm long), 11.4 ("PA" spaced in right "Panama), 11.5 ("Panama"s 1½mm below bar), 11.6 (one "Panama" only), 11.7 (two "Panama"s close together), 11.8 (three "Panama"s), 11.9 ("Panama" split horizontally), 12a ("Canal" in antique type), 12.1 ("AL" of "Canal" spaced, also 12.17 and 12.27a), 12.2 ("N" antique in "Canal"), 12.4 ("L" antique in "Canal" and "Z" antique in "Zone"), 12.5 ("Z" antique in "Zone"), 12.7 ("Pamana" reading up at left), 12.11 (right "Panama" 5mm below bar), 12.14 ("Pan ma" at right), 12.15 ("Anama" at left), 12.18 (third "A" short in left "Panama"), 12.20 ("N" with double diagonal stroke in right "Panama"), 12.21 (third "A" shifted in right "Panama", with right "Panama" 5mm below bar), 12.24 (one "Panama" only), 12.26 (three "Panama"s), 13.1 ("AL" of "Canal" spaced, also 13.12), 13.2 ("N" antique in "Canal"), 13.5 ("E" of "Zone" faintly printed), 13.9 (right "Panama" 5mm below bar), 13.11 (defective letters in "Panama"s), 13.14 ("N" with thick left stroke in right "Panama"), 13.16 (one "Panama" only), 13.18 (three "Panama"s), and 13.19 ("Panama" split horizontally), many varieties contained in blocks, generally fine to very fine, a wonderful opportunity for the specialist that requires a close inspection