franked with a “Sui (IV)” postage meter label of 15 fen and four 10 fen Dr. SYS unit stamps, tied by Kutsing cds, paying the correct foreign airmail rate of 55 fen. This cover, addressed to Latin America, represents a highly unusual destination during the Silver Yuan period, reflecting the limited but significant long-distance postal connections from South China to Central and South America in the immediate post-war era. The combined use of postage meter label and adhesive stamps illustrates the flexible franking practices adopted under conditions of irregular postal supply. According to records, only one such Silver Yuan postage meter cover to Latin America has been recorded. The present example, clearly struck and correctly rated, is a unique survivor, offering important insight into foreign airmail rates, transoceanic routes, and practical meter usage in this transitional postal period, and is of considerable postal history and exhibition significance.

bearing a total of sixteen stamps, tied by Sining cds. The franking includes ten Gold Yuan stamps with a total face value of 5,000,000, converted at the contemporary rate to 64 fen in Silver Yuan currency, together with six Revenue Surcharged Silver Yuan stamps totaling 51 fen, making an overall postage of 115 fen. This correctly pays the foreign double-weight registered airmail rate applicable to the Northwestern region for the period Jul 5 to Sep 5, 1949. Of particular significance is the mixed franking of Gold Yuan and Silver Yuan issues, clearly illustrating the transitional currency conversion practices during a period of rapid monetary change, especially as applied in the Northwestern postal system. Such international registered airmail covers bearing mixed currency franking are of extreme rarity, with only one recorded example. The cover shows clear cancellations and a complete rate structure, providing an outstanding illustration of postwar currency reform, exchange conversion, and long-distance airmail operations, and is of considerable importance for postal history study and exhibition.

On obverse is a single unit stamp paying the registration fee 12 fen, while on reverse are twelve Gold Yuan stamps totaling $600,000, which at the prevailing conversion rate of $150,000 fen to 1 Silver Yuan equals 4 fen, making a total postage of 16 fen. The franking correctly pays the domestic registered rate, comprising the basic letter rate plus registration fee (rate period Apr 49 to Jul 31, 1949). Tied by Pingyueh cds dated 38.5.25 and arriving Chungking on May 29, 1949. This cover is of particular importance for its mixed franking of Silver Yuan and Gold Yuan stamps with a clearly defined conversion, illustrating the practical postal accounting and currency transition under conditions of rapid Gold Yuan devaluation. It provides a representative example of regional postal operations and rate application during the concurrent use of dual currency systems, and is of significant postal history and exhibition value.

bearing a total of ten stamps, comprising six Silver Yuan unit stamps totaling 12 fen and four Gold Yuan stamps totaling $2,000,000. At the prevailing conversion rate of $250,000 to 1 Silver Yuan fen, the Gold Yuan franking equals 8 fen, making a total postage of 20 fen, correctly paying the domestic registered rate (rate period Aug 1 to Dec 8, 1949). Tied by Shihwantan cds dated 38.9.4 and arriving Chungking on Sep 9, 1949. This cover is of particular importance for its mixed franking of Silver Yuan and Gold Yuan stamps used at a very late stage, after the cessation of sale (July 20) and official invalidation (July 23) of Gold Yuan stamps. It represents an extremely late and rare practical usage, reflecting continued local postal acceptance and conversion handling under conditions of rapid currency transition. According to records, such late mixed-franking covers are exceedingly rare, and this example is regarded as one of the last recorded usages. It holds significant postal history and exhibition value for the study of post-war currency reform, rate conversion, and postal operations in the Southwest region.

bearing four 4 fen revenue surcharged stamps overprinted in red with the local post office name “Tzelutsing,” totaling 16 fen, tied by Tzelutsing cds. The cover was routed via Chungking (Aug 16, 1949 transit) and arrived at Lanchow on Sep 11, 1949. The franking correctly pays the domestic airmail rate of 15 fen for the period Aug 1 to Dec 5, 1949, with a slight overpayment of 1 fen. Of particular significance is the use of locally overprinted revenue surcharges inscribed “Tzelutsing,” representing a provisional and highly localized postal issue of great rarity. This is believed to be the only recorded commercial cover carried across both Nationalist (KMT) and Communist (CCP) postal territories. Posted in a KMT-controlled area, the cover transited Chungking before entering CCP-controlled Lanchow, clearly illustrating the continuity and transition of postal operations during the change of regimes. As Tzelutsing had no airport facilities, the cover was first dispatched to Chungking to access airmail service; however, prior to the fall of Lanchow in late August 1949, all aviation facilities had been withdrawn. Consequently, although sent at the airmail rate, the cover was ultimately conveyed by surface mail, creating a notable discrepancy between paid service and actual transmission. With its complete routing and exceptional postal features, this cover holds considerable importance for the study of post-war postal operations in Southwest China, local provisional overprints, and cross-regime mail routes, and possesses outstanding exhibition value.