1928 Ecuador air post stamps of 1923 surcharged Provisional in carmine, Scott C2-5 and the very scarce C6 50 cts on 10c green, mint n.h., very fine and fresh; Yvert €2885 for mint hinged. (Image)

1949 3s Air Mail Miguel Cervantes error of colour s blue and brown instead of violet and red brown in left marginal block of four, as well as 1949 2s error of colour red and violet instead of black and red brown (unlisted in Yvert), extremely rare with only one sheet of each printed; mint never hinged, extremely fine (Yv. €4'800 x 2), a attractive pair with appeal to airmail collectors and collectors of famous authors, with Calves certificates. (Image)