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In 1948 Omas introduced the Extra 55X line which comprised ogiva and facetted shaped piston fillers in three sizes: 555 (lady), 556(senior) and 557 ( oversize).

The "S" suffix was used for cylindrical pens ( S: Semplice), while facetted pens were identified with the "F" suffix ( F: Facetted).

Colors were black, gray pearl and tortoise brown.

The Extra 556/s was one of the most successful models ever. It was the perfect pen,  slender and light to use; it could perfectly fit female  and small male hands.

This Omas 556/S in  gray pearl celluloid is in excellent  condition and it is fitted with an extremely  flexible F nib.

Unfortunately there is a small scratch exactly over the barrel imprint.