Lot 40388 – 1887, In-depth postmark collection on the UPU pyramid issues

1887, In-depth postmark collection on the UPU pyramid issues, with about 250 stamps written-up on quadrille album pages, headed by a hand-drawn map showing the location of the towns, then the numeral and town letter-types, organised from 1S (San Juan del Sur), through to 13N (San Juan del Norte), incl. 15c yellows with 3G(Granada), 4J (Jinotepe), 9C (Corinto) and 13N, some unusual colours of cancel here as well, followed by the various types of target cancel including unusual 2-ring ‘T’, 4-ring in violet, etc, then town names in circles, with Acuyapa, Chinandega, Corinto, Granada to 15c, Jiugalpa, Leon, Managua, Masaya on 15c, Rivas, Sur, etc. An excellent study with many scarce items. Please inspect.