Help Identifying Stamp

THE ECUADOR STAMP CAN ANY OF EXPERT HELP


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It looks to be a revenue stamp not a postage stamp.

Timbre Fiscal = Fiscal Stamp, so yes a revenue stamp.

See page 37
http://guayaquilfilatelico.org/bibl...e_fiscal.pdf

NSK, in the catalog "SIN BIENIO" is printed from bottom to top, and in this thread - is the opposite. Does it have any significance, like the place of issuing or type of usage?

I am not an expert. I found the document online.

I looks like stamps that had a validity of two consecutive years (bienio) were overprinted 'sin bienio' to make them permanently valid.
Such overprinting must have occurred on individual stamps or sheets (probably the latter). Feeding a sheet upside down will result in such variation and is easily done.

Contacting the source of the document might be an option to get more information.