China 1943, rare and possibly unlisted overprint featuring the black vertical "Hwa Pei" (華北) characters for North China, applied to a 20-dollar crimson and blue Sun Yat-sen issue. While similar to Scott IM 8N67, this specimen appears to be printed on the design of Scott IM 8N65, distinguished by the alternate portrait of Sun Yat-sen, potentially indicating a misused plate or unauthorized hybrid production. Issued under Japanese occupation for the North China Postal District, such overprints marked restricted regional use. Printed by gravure without watermark, with perf 12½ and clear, full original gum. No official record confirms this pairing, suggesting either an unlisted printing variety or a post-production error. Visual inspection confirms intact perfs and rich coloration. A scarce and unusual philatelic anomaly of propagandistic wartime printing. Estimate "$320 – 420"