6c ORANGE INTERIOR RATE ENVELOPE

GUATEMALA CITY to SAN JOSE                                           JULY 13
6c Exposition envelope with 6c stamp issue for double domestic rate.
Backstamped RECIBIDA / SAN JOSE on the same day.
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FLORES to COBAN                                                                 MAY 17
6c Exposition envelope with 50c stamp issue for 56c rate. 

Judging from envelope size franking overpaid maximum 28c triple 
domestic registered rate by 28c.

GUATEMALA CITY to SALISBURY, ENGLAND                              NOVEMBER 20
6c Exposition envelope uprated with 2c, 6c 10c stamps on front and 1c on verso
for 25c single foreign registered rate with acknowledgement receipt.
Received on front LIVERPOOL / 12 DEC  and on following day at Salisbury.