Also introduced at the same time as  the new Vest-Parkers pens and pencils desk set equipped with both a fountain pen ($5.00) and pencil ($2.50), each convertible could be changed in seconds from desk use to pocket use simply by exchanging the cap for the desk taper.

In place of cumbersome old inkwells, desk sets become popular in offices, banks,  and hotels, with businesses equipping their facilities with Parker desk sets. Even airlines carried them on their planes.

“Every time you sell a pen, say to the customer, -Now you have half of a modem writing outfit, and then display the base.” Parker continued its commercial promotion and offered its dealers a free oval porcelain Desk Set, complete with a $5 Duofold Junior pen for purchases over $60, or two sets for purchases of $100.

The pen manufacturers, who by this time had already introduced their own desk sets,   could  now boast of  the economic advantages of a desk fountain pen. Parker commissioned Edwin G. Booz Laboratories in Chicago to carry out a scientific survey to determine the efficiency of Parker Duofold desk sets, resulting in the conclusion that employers save 6.26% by equipping their employees with Parker utility desk sets. A sales pitch used by Parker informed potential customers that an employer could save $112.50 a year per office worker by purchasing  Parker desk sets,  repaying  their  cost in just a few months.