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It is priced between $6 USD for lower end models, and $20 USD for higher end models, such as special editions.
Because of its quality, the Jotter has become somewhat of a standard by which ball pens are measured.
Parker 51 pens with two imitation jewels--one on the cap and another on the end of the pen barrel--remained in production until 1948, although very few were made after 1946.
If there is no Parker imprint around the end cap and the pen has two jewels, it can be dated most likely between 19.
The jewel on the end cap (tassie) is affixed to the top of the screw that holds the pocket clip in place.