Theme : Stamps on Stamps (postal services related stamps) - 04

Letter boxes on stamps, they are double as interesting as they show stamp history on stamps.
Greek postal services issued a set of 4  (8) stamps on this topic, to commemorate 190 years of the founding of the Hellenic Post, by the first Governor of Greece, Ioannis Kapodistrias.
Underneath the letter boxes, we see, in greek capital letters : "190 χρόνια ελληνικά ταχυδρομεία";
which means as much as 190 years of Greek (Hellenic) post.

4 stamps printed in sheets of 5 x 5 stamps, perforation is 13,75 x 13,75
€ 0,10 - 500,000
€ 0.50 - 1,000,000
€ 0.72 - 500,000
€ 2.62 - 1,000,000

the 'regurar' stamps come in full colour:

A week later, the same stamps were issued in a sheetlet of 8 (2 of each), with another perforation 13,25 x 13,25. This sheetlet was printed by Cartor Security Printing
They come in a sheet of 4 - so each stamp twice.

sheet of 2 x 4 greec letter boxes

The letter boxes are printed in gold/bronze emobssed printing, and only 10,000 sheetlets were made.

detail of 4 Greek letter boxes