Stack's Bowers & Ponterio
Collector's Choice February 2022 Auction 22-24 Feb 2022
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1) 1891-Zs FZ. KM-377.13; DP-Zs77.
2) 1892-Zs FZ. KM-377.13; DP-Zs78.
Another engaging pairing of heavily countermarked issues, attesting to their usage in trade in the Far East.