From 1964 Sport magazine. Mantles XPG6H may have the leather web connector strap wrapped by rolled lacing.
Other purported Mantle game models have the leather connector strap wrapped with rolled lace between the webs.
The model below is circa 1962
Below is the Billy Crystal glove with a cut off web strap and added rolled lacing.
below is a circa 1966 Mantle game model with the leather connecting strap intact
Below are a couple of store models. First is a is a Mantle XPH6-H with the leather strap web connector and the later "H-Web" stamping
Second is a killer Mantle XPGH with no leather connecting strap designed into the glove, just the rolled lace. This one has "H-Web" stamped on the thumb and possibly a mid to later 60's model.