Turkish Aerogramme Advertising Meter Mark

At first sight, this cover does not look very interesting at all.

However, this is a meter mark advertising the use of aerogrammes in Turkey. 

Turkey issued its first (and as far as I know its only) set of aerogrammes on November 21, 1963. This meter mark is dated July 23, 1963 about four month before the first day of issue of the aerogrammes.

As the sender appears to be a private person, I think the meter mark was applied in a post office, to which the letter was submitted and postage was paid in cash.

The slogan text translates into something like "An aerogramme is handy and inexpensive".

As this blog is about aerogrammes here is one of the aerogrammes (#3) of the set that was issued in 1963.