Parker 51 Custom in Teal. Boxed and Immaculate.The Parker 51 Custom was an upgrade to the 51 Classic in that it had a 1 10th by weight 12 Ct. rolled gold cap, whereas the classic came with a 'Lustralloy', or steel cap. This is a superb example of the Parker 51 Custom, made in in the early 1950s. It is finished in Teal, named after the wing flash on the duck of that name. It is a very attractive blue green with a 12 Ct. rolled gold cap and is in perfect condition, I doubt that it has ever been