Ok, I’ve just managed to find the following information from Lih-Tah Wong’s Parker75.com (Mr Wong is a generally renowned expert in 75s) regarding the cross-hatched engraved pattern that is commonly referred to as the Cisele:
QUOTE
This is the pattern that started the commercial launch in 1964 of the Parker 75 family. It is a very distinctive pattern rumored to have originated from a cigarette case owned by Kenneth Parker that was made by a 19th-century English silversmith. This pattern was produced for the entire production lifetime of the Parker 75 family and so there are more of this model than any other Parker 75 model.
When first introduced, it was known simply as the sterling Parker 75 in the crosshatch grid pattern. Evenly spaced lines engraved around the barrel and cap, and down along their lengths form the square grid pattern. A patent for the design as applied to a writing instrument was filed on June 5, 1964 and finally granted on September 27, 1966. Today this pattern is so recognizable as a Parker 75; there was even a 75 cigarette lighter, knife, and souvenir keychain in this pattern. Of course other pen manufacturers followed suit with similar designs in this classic pattern.
QUOTE
When production of this family was started in the Meru, France factory, however, the name Ciselé (French word for "engraved") was given to this pattern. This name has stuck and is now applied to this pattern, regardless of whether it was made in the US or France.
In his website, Mr Wong also refers to similarly (crosshatch grid engraved pattern) designed pens made by other brands as being of Cisele design.
I suppose this is not necessarily definitive but this is all I can find so far.
raf.