High Grade
There are a total of 8 varieties for 1938 1 Kopek, and 4 out of those 8 are scarce with equal relative scarcity, according to Fedorin, priced at "25 u.e." each. All of those 4 have either one of 2 varieties of "raspolozhenie uzelkov" which is "scarce". And in both of those cases inner right knot is RIGHT BELOW (AGAINST) "8" in the date (1938).