Rawlings thought so highly of their Trapeze model glove that they filed for both a design and a utility patent in 1958 and approved both in 1960. The design patent was unique in that the glove pocket extended way up the finger stalls.
The Rawlings prototype glove below reflects that design patent.
Melvin Heiman of Hilcrest Sporting Goods patented his own version of a joined finger glove in 1965. Besides the joined fingers the Heiman patent glove had a unique web that was an extension of the thumb and forefinger stalls.
I couldn't find an example of that glove. Once the patent expired in 1980, Akadema cited it in their "Reptillian" model gloves.
Hillcrest Sporting Goods of New York was an import agent for various U.S. sporting goods companies. One of their clients was Trio Sporting Goods of Chicago. Trio was formed by three former concentration camp survivors who immigrated to the U.S. in 1945. Trio/Hillcrest imported gloves made in Japan using leather supplied by A.J. Hollander Co. of New York, a major exporter of leather hides.
Below is an example of a Trio Hollander glove.