Greece : Covers

I wonder if the paucity of Greek covers here indicates a lack of interest in that part of the Balkans, there are some great stamps from this part of the world ............   anyway, here is the second cover in this sub-section, posted Air Mail in Athens on 17th November 1932 for a London destination.
Interest in this one relates to the dark and light printings of the image  -  this 2 drachma value is described as the 'Acropolis' - SG 418, with the re-engraving as 418b, is part of the 1927 to 1935 pictorial issues with values of 1 to 80 lepta and 1 to 25 drachma, and with a few values having been re-engraved either by the Polish printer or DLR.                         The 80 lepta value, from this series, showing the Corinth Canal is a well known low value Greek stamp and an impressive image.         

Printings look to have been the work of Perkins Bacon and a Polish venture, and possibly the re-engravings were by DLR and the Polish connection too (according to my rather old S.G. catalogue), and looking at the two versions here there is no doubt the quality of the engraving appears more detailed and delicate on the lighter stamps, so going by the words in my 1961 SG catalogue ......................""Polish printings:  Apart from the difference of perf., the lines of shading etc., in the Polish printings are much sharper than in the Aspiotis printing.""                    What 'Aspiotis' means I've no idea - enlightenment please. 
We're accustomed to seeing high quality images in modern catalogues and the poor quality of b. & w. only pix in these older editions make for less than accurate help, plus it has to be said that some of these earlier issues from Greece aren't the easiest to understand if like me you're a bit thick. 
It may be that the two groups of stamps seen on this cover are the work of different printers, or perhaps it's simply that the guy who applied the ink was having an off day.     I have several similar covers with this 2 d value where the background 'mount' is less dark but with the foreground cypress dark, and there's no denying the contrast of this dark and light makes for a better image, so maybe those stamps with the overall dark 'mount' are the over-inked stamps.
   
Digressing for a moment  -  I'd not realized the esteem in which the Greeks held Byron  -  ultimately he gave his life for their cause against the Turks, and they honoured him in 1924 with an 80 lepta stamp - and seems there are many roads dedicated to his memory in Greece  -  they speak his name with reverence apparently  -  and so do I as it happens.         You don't hear the same eulogy from the good burghers of Venice  -  perhaps that was due to his over-keenness of young Venetian girls.