In 1965 Melvin Heiman patented a new version of the duck web design. Like the earlier "Duck Web" gloves, this design featured the finger stall section sewn onto the back of a one-piece padded palm. There are various lacings forming the pocket and hinging the web but the front face of this glove including the web are from one piece of leather. The historical references cited in the patent documentation all have this feature.
The main reference cited is the Rawlings 1911 patent for a "Duck Web" glove. Just scanning both patent illustrations, one can see the similarities. 1911 Rawlings "Sure Catch" model below