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What happened in the meantime?
I have a number of Scott U.S. Specialized catalogs going back to 1986. Here's a history of E5a:
1986: E5a imperf. pair is listed and noted as "not regularly issued." The dots variety is listed, but no cat. number assigned.
1987: E5a imperf. pair is listed, but note is deleted. Dots variety listed, no cat. number.
1989: No change from 1987.
1994: E5a imperf. pair no longer listed. Dots variety listed, no cat. number.
1999, 2000, 2001, 2004: No change from 1994.
2007: Dots variety elevated to minor number status, given Scott no. E5a.
The E5a imperf. pair was dropped between 1989 and 1994.
The E5a dots variety was elevated to minor number between 2004 and 2007.
Robert