Hi JVPool That stamp "el Salto de Agua" is most likely either Scott 634 (1923) un-watermarked, rouletted 14 and 1/2; or Scott 642 (but I do not think it is - perf 12 not rouletted) or 650 rouletted 14 and 1/2 with watermark 156.
That is my best assessment as I have quite a few of that El Salto de Agua (Pubic Fountain) stamp.
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