They are most likely Scott #552 as they appear to be perf 11x11, the second being from a booklet pane of 6 (two straight edges).
You should measure the stamp though as there is an extremely rare issue, Scott #594, which is slightly larger and printed on coil waste. Scott #552 measures 19x22mm, and #594 is approximately 19¾x22¼mm.
You should acquire a perf gauge to check the perf size yourself if you have many stamps. They are inexpensive and an invaluable tool.
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Posted 11/09/2016 5:38 pm
