Stamp 1 cent G. Washington perf. 10 x 11 single watermark (?)

Stamp 1 cent G. Washington perf. 10 x 11 single watermark (?)

Stamp 1 cent G. Washington perf. 10 x 11 single watermark (?)

Perforation: 10 horizontal and 11 vertical
Face value: 1 cent
Year: 1920 ?
Green color
Watermark: single S up on the right side (?)
Used

I am not aware of this postage stamp in the Stampworld and Colnect net catalogue. I can't find any information with this kind of stamp (I only know the 10 x 11 example without watermark from 1920)
If there is anyone who can inform me about this postage stamp, I would appreciate it.

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Fernando Jorge G.

Anunciante desde Set. 2016
Verificado com 125 anúncios publicados Lisboa - Benfica
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