I have these stamps on a cover and I think they are carmine lake. So I have them next to other carmine stamps for comparison. Also I have a close up of the plate number . I think 15871 or 16677. leaning toward 15871.
The comparison should be between your cover and other 599's.
The comparison here is against sheet stamps where Scott lists: 554 in carmine, light carmine, and deep claret, 583 in carmine and deep carmine, and 634 in carmine, carmine red, and carine rose. Thus I would suggest an impossible apples and oranges task, (not to mention the variability of scanners, software and monitors),
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