My post on Covey and his designs is at http://oztypewriter.blogspot.com/2011/06/on-this-day-in-typewriter-history-xxxvi.html
While the newer styling was created in the US, the machines were made by Royal McBee Nederland N.V. in Leiden in Holland. Royal had opened its new Dutch factory in 1953 and the following year announced plans to merge with McBee, a then leading manufacturer of accounting and statistical machines and supplies.
Royal McBee portables continued to be produced right up until the time Litton Industries took over Royal in March 1965.
A proper typewriter case was reintroduced with the new Covey designs