1898 (Sept 16). Civilian cover to New York, franked by 1c and pair of 2c, showing in center "MIL. ST./MAYAGUEZ/P. R." provisional railway duplex cancel, Military Station No. 1 Ponce transit and New York arrival on reverse; a very rare early mail (only ten days after the station was opened) with only five examples recorded of this provisional, all applied on civilian correspondence; ex Acevedo and Kugel. (Image)

1898 (Oct 19). Commercial envelope from San Juan sent locally to Arroyo, franked by 2c in mixed franking with Puerto Rico 1898 2c & 3c (round corner at upper left), all tied by "MIL. ST./SAN JUAN/P. R." provisional railway duplex cancel, with receiving Military Station No. 1 bs, some toning and tear affecting the Puerto Rico 2c at top left; a very rare U.S. and Spanish stamps combination franking (described by AIEP Francisco Graus in the certificate as "of exceptional rarity"), one day after the turnover from Spain to the U.S.; cert. Graus (1990). (Image)

1899 (Jan 19). Incoming cover from Spain, franked by 1876 1/4c pair uncancelled, with receiving Military Station No. 3 cds on reverse, a scarce usage on incoming transatlantic mail. (Image)

1899 (Feb 7). Commercial cover (upper flap missing) to New York, bearing 5c tied by Guayama Military Station no. 2 duplex cancel, struck in transit with part of receiving Mil. Sta. No. 4 cds of San Juan on reverse, some imperfections to cover and slight perforation toning. (Image)

1899 (Feb 16). Registered cover front to New York, franked by 5c pair and "Trans-Mississippi" 2c (4), cancelled by segmented cork type, showing very fine "REGISTERED/Military Station No. 4, Washington, D.C./SAN JUAN, PORTO RICO" four-line hs in purple, a scarce double rate usage; ex Roca and Acevedo. (Image)

1899 (Feb 17). Soldier's mail cover with decorative hotel illustration from San Juan to Reading, bearing 2c tied by MiIlitary Station No. 4 duplex cancel, arrival on reverse, cover edge faults at top, otherwise very fine. (Image)

1899 (May 17). Cover to San Juan franked by "Trans-Mississippi" 2c tied by negative oval handstamp and cds of Morovis, Spanish "Vega Baja" and receiving Military Station No. 4 cds of san Juan; a rare use of a Spanish cancel on mail within the island; ex Gallagher and Heimburger. (Image)

1899 (Aug 10). Postcard from Ponce to Caracas (Venezuela), franked by Puerto Rico 2c tied by Military Station No. 1 duplex, with contents relating a "horrible cyclone ... there is not a single house that has not suffered, one can hardly walk on the streets"; a rare destination. (Image)