Another group of spark keys, from left to right:

Speed-X key, with 7/32” diameter contacts.

Made in the U.S.A.

Raymart Speed Key with 7/32 contacts.

Sold by the Raymart Craft a  Creed Company, Birmingham, England.  C. 1942.

Another  Speed-X key with 7/32 “ contacts.

Has a different base than the one  mentioned above.