Yes I looked up stamp Scott #552 in a (2019) Scott Specialized Catalog , and 1st day of issue reads 1923.Correct me if I'm wrong.? It reads 1st day issued Jan.17,1923..Scott 552..

Scott#551 (4 sheets full pane. #20371).

Another way to tell: Scott #551 would have a Plate Block of 6 and Scott #653 would have a Plate Block of 4.

Plate #20371 was only used for #653 not #551.

Scott#551 (4 sheets full pane. #20371).

I have 6 sheets of these maybe more #551

I have some partial sheets of scott #551 and 562 if there are 3-4 stamps missing from the sheet is it better to break it up into blocks of 4-6 or pairs ? Or sell the partial sheet

One newly discovered area are the Nagis. #3, #4, #40 though #47. And what are the #55 through #62 series? Obviously more rare.

likely a #76. But right next to it is offered a #55. Is this really one of the 21 existing copies? And why is it cancelled if they were never issued for postal use? Is it wrong to call them out on th

If this is sn#558 Mystic sells singles of this stamp for $60.00. I know they may be over priced, but looks like you have quite a find. Should be worth a considerable amount of cheddar!