1912-1913, Official Seals, Hyphen-Hole 6.5 and Compound Perforations (OX14-OX15a). Seven covers on exhibit pages, four with hyphen hole perf 6.5 seals, three with 2c 3rd Bureau Issue, one with four-color franking incl. 10c Registry Issue, interesting example from Miles City MT to Victoria B.C., forwarded to Seattle, then to Oakland, then to Aurora Ill., also single example of perf 12 x hyphen-hole 6.5 (pair) on 2c entire, finally two examples of the scarce hyphen-hole 6.5 at right x perf 12 on other sides, attractive group, surprisingly difficult to find examples of the compound perfs on cover

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