Yes, that's what more or less what I thought, too, Pamela. But the hobnail pattern on Hammonia is not always up to the rim. Yes, on bowls, but not on other shapes. And of course, we can't be sure that every shape was shown in the catalogs.
But then when I look in the United States Glass catalog, I can see the pattern and a similar shape, but the proportions are really not quite right.
No easy answer.
Fascinating. And proof again how the makers on both sides of the Atlantic loved to plagiarise. Or was it more a case of "imitation is the most sincere form of flattery"? Or perhaps the crucial point was these patterns are popular and sell. :lol: