Maybe This One Could Be Candidate For 596 Rare Stamp

I will buy an 597 and 581 for compare my stamp because I'm not sure If I have one.
I'm not change my opinion if is possible not certainty it is 596.
What I meant was that at that time there was also this cancellation.
And it is possible that a worker put the cancellation on a 596 stamp just as he did on 594 stamp.
I don't think that necessarily only the existing cancellation on 596 exist.It may be that too.
Of course the size of the design is not a 594. It is closer to a 596.

If that matters too.
Certainly if the size of design was 19mmx22mm it was not uncommon.
There's no upset that it wouldn't be 596. I just asked community a question so I can build on whether or not to send it to expertise.

Have a good day!
Michael

There is no need to buy any other stamps.

If you look at your third photograph, it takes 21 mm to get 11 complete perforations vertically. This is a gauge of (11/21)20 = 10.5.

The perforation gauge of your stamp is thus 11 x 10.5, so is a 632.

Jan

In figure 3 I measured the vertical part of the design of stamp not gauge.
But If I look better I see in 20mm we have 11 perf not like you say 10.5.
I will put into professional tool to see better gauge and I think is not expesive to spend 100$ to send this stamp to http://psestamp.com/.

Thank you for your opinion.
Michael

When you send it in, the people who are going to examine your stamp are some of the same people who you will find as members of this community. We tried to help but go ahead send it in, when you get the certification back please use 'Send Note To Staff' to get this thread unlocked.
Don