eapg Loop and Dart Group confusing

I am searching for help on my Leaf and Dart 5 ½” Tumbler in which I describe as “Leaf and Dart with Diamond Ornaments”, (which may or may not be correct). William O. Davis, of Portland Glass first patented the “Loop and Dart” in 1869 and Portland Glass produced this pattern until 1874 from information provided by DoRi Miles and Brad Gougeon. Later Richard and Hartley Flint Glass Company produced the Leaf and Dart and Loop and Dart with Diamond Ornaments between 1870 and 1888. Richard and Hartley later joined the US Glass Co. in 1891 and later produced the
Leaf and Dart patterns as well. With so many companies producing the Loop and Dart patterns, I cannot get a precise handle on who exactly made this pattern and when. My gut says it is the Leaf and Dart with Diamonds and it was made by the US Glass Co. sometime after 1891. Can you help? Thanks