Italy / Aegean islands – Cos year 1916 20C with watermark stamp Perf: 14/Wm postage stamp
The stamp is from Cos (the Italian name for the island of Kos) and is a definitive stamp of the Kingdom of Italy overprinted with the island’s name.
Here are the details for the Cos 1916, 20 Centesimi watermarked stamp:
🇮🇹 Cos (Kos) 1916 Overprint
| Detail | Description |
| Issuer | Italian Administration of Cos (Aegean Islands) |
| Year of Issue | 1916 (Later issue/surcharge) |
| Denomination | 20 Centesimi (20 C) |
| Overprint | The word “COS” is overprinted on the base stamp. |
| Base Stamp | Italian Kingdom definitive stamp, typically the Michetti Series (featuring King Victor Emmanuel III). The color is usually orange-brown or brownish-red. |
| Watermark | Crown (Corona). The presence of the crown watermark distinguishes this stamp from earlier printings or varieties which were unwatermarked. |
| Catalog Note | The 20 Centesimi stamp in the Michetti design was originally issued in 1916 without a watermark, but was reissued with the Crown watermark and a perforation of 14 in October 1917 for general Italian use. For the Aegean Islands, these watermarked stamps, overprinted “COS,” are listed in specialty catalogs like Sassone and Michel. |
The fact that you specified the watermark is key, as the underlying Italian base stamps had variations in their paper and watermarks during this period, which led to distinct and separately cataloged stamp varieties for the overprinted island issues.



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