If the 30 you are referring to is similar to the ones pictured (black inner picture, orange frame) it could be Scott #71 or 86 #71 has no watermark, on salmon paper #86 has a watermark of lozenges (diamonds), on buff paper There are also some varieties of #86 that have different shades of colored paper (cream: CV$90, pale yellow CV$1.75, yellow orange: CV$82.50). A more specialized catalogue (Michel) may have even more varieties. It can be difficult to tell stamp colors apart though....
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