Graf Zeppelin c13, c14 and c15 set of three mint unused 1930 airmail stamps USA

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Graf Zeppelin c13, c14 and c15 set of three mint unused 1930 airmail stamps USA:
$1250.00

Obtained from an \"old money\" estate in Los Angeles many years ago. Beautiful set, in awesome condition. It was appraised at $1100 in the year 2000. Of interest to the appraiser was the excellent centering and color, I recall. The value surely has increased since then.... Modest BIN asking price, reasonable offers considered...