This is an early Spain Aerogramme (Greiner #5c) with the following characteristics:
- Air Mail routing instruction includes admonition (type II)
- 1.30 Ptas indicium, type I (with "Venta De Sellos")
- light grey overlay
- narrow angle of areas omitted from overlay to fix sealing flaps to
- utility model # 12.293 (on reverse)
What is special here is that it is a double print of the overlay which appears dark grey instead. This can easily be seen in the close-up below.
Reference:
Greiner/Greiner, Aerogramme von Europa, 3e, 1993
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