I recently purchased the full sets of industry definitives for 1958 & 1959 (and 1961, but they are not the issue).
noticed that the 1958 set has a 10d Sisak in green. the 1959 set also has a 10d Sisak in green. Michel lists these as MI#856 and MI#892, respectively. SCOTT only lists the 1958 version as SC#513. is there a difference, and how do I discern the difference?
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