Lot 321 United States (C) 1966, 1975 & 1977 Operation Deep Freeze, 3 Very Fine Used Covers, US Naval Support Force & South Pole Station Commemorative Covers, Different Cachets

3 very fine used covers, 1966, 1975 & 1977 Operation Deep Freeze, US naval support force & south pole station commemorative covers, different cachets.

Scott doesn't list these varieties, so we estimate them at $25. The stamps offered here grade 75 as follows:

Centering/Margins: 35/60

Paper Freshness: 5/5

Colour: 5/5

Impression: 5/5

Absence of Visible Paper Flaws: 5/5

Perforations: 10/10

Cancellation: 10/10