I thought I'd just briefly comment on this, so it doesn't get missed - as the notation on the cover indicates that someone thought this was the 3 GENTS variety, which is position 66R2L.
I have only glanced at it, but it does appear to me to likely be 66R2L. The inner-line plates, of which 2L is one and your stamp is, are much scarcer perforated than the no-inner line plates.
This is indeed a #25A showing inner lines, and appears at first glance to be a major variety of #25A - 66R2L, 3 GENTS.
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