No labels/brand names on the windows to be found. 1/2 inch tall, 17/32 inch wide. Closest match I could find (so far) is item 55-197. Thanks for the help!
Bob from SWISCO responded:
October 26, 2020
The 55-029 comes to mind for me. But if you want, you could order samples of both glazing beads from this Samples Page here.