the exhibit balance of the Paul Ammons collection consisting of 49 covers neatly mounted and described, note interesting covers including (in no particular order): first day of use certified mail service, 1932 registered from Gatun to Roessler in New Jersey, 1942 special delivery with censor tape, several registered censored covers, various customs markings, December 16, 1941 cover with "Released by P.O. Inspector Engaged on Censorship" handstamp used in San Antonio for less than three weeks in December 1941, and much more, generally fine to very fine, an extraordinary group selected for their interest and scarcity, not to be missed by the specialist in Canal Zone airmail