Vintage Chromatic USA double-twist ballpoint. Chrome ribbed metal. Twist one way for one color, the other way for the second (usually blue/red). Clip marked PAT. CHROMATIC USA. Made in USA, 1950s–70s by Ritepoint. Twist works. Ink is dried — needs Long D1 / Chromatic refill.

tags only: chromatic, chromatic usa, ritepoint, vintage pen, twist pen, 2 color pen, dual color pen, chrome pen, metal pen, made in usa, pat chromatic, ballpoint, vintage ballpoint, mid century pen, advertising pen, collectible pen, long d1 refill, 1950s, 1960s, 1970s, ribbed pen, knurled pen