The story of Eversharp and Kimberly is a bit strange. Eversharping were suing a lot of companies they suspected to have copied their Biro patent of Capillary Attraction. When they got to Kimberly they realized that their refills worked better than their own. So, they bought Kimberly and started using Kimberly refills instead of the Eversharp CA refills.
Here is an early Kimberly pockette together with a later set of BP - a Retractable and KIM Pockette.
and an 1953 ad of the Retractable and Kim