In 1948 Omas revised the design of its lines of pens and introduced the EXTRA 55X series.

The EXTRA 55X series comprises facetted pens in three sizes ( 555/F, 556/F, 557/F) and cylindrical pens in three sizes  ( 555, 556, 557),too.

Colors were black, tortoise brown and pearl gray.  A very limited number of  faceted pieces were manufactured in lined gray celluloid; the cylindrical version was also offered in cappuccino celluloid and a very defer pieces in blue, too (only 555 are known)

556X cylindrical pens were fitted with Omas Extra nibs, while facetted pens, which represented the top of the range, were fitted with Omas Extra Lucens nibs.

Extra facetted pens have a very clean and elegant design and offer a very high quality of writing, derived from their very precious nib.

This Omas 556/F in black celluloid is in excellent condition and it is fitted with a very pleasant, very flexible nib.