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It should also mentioned two models introduced about 1950 and remained in production for a short time, the [[Omas 35x|351]] and [[Omas 35x|352]]. These pens are very rare and hard to find, they have faceted shape and [[piston filler]] and they barrel was made by gluing alternating sections of transparent and colored celluloid, so as to achieve an outstanding result of a transparent tank in alternating sections.