



A couple of strips with this overprint:
https://www.ebay.com.au/itm/235889863672 ...
Thank you very much for your response. Very interesting, and it at least gives me a starting point.

Sorting through a pile of material, I came across these two interesting stamp from Costa Rica. Scott #71 & #73 with a square "AEREO" overprint and surcharge. The surcharge on #71 is 4 cts. However, I cannot read the surcharge on #73. Now, since my interest is in worldwide airmail stamps, I wonder what these are. Does anyone have any information on these stamps? Does the entire 1910 regular stamp issue (Scott #69-76) exist with these overprints/surcharges?

re: Costa Rica Overprint 'AEREO' c.1910
A couple of strips with this overprint:
https://www.ebay.com.au/itm/235889863672 ...

re: Costa Rica Overprint 'AEREO' c.1910
Thank you very much for your response. Very interesting, and it at least gives me a starting point.