huge old ironstone china saucer plates WWII vintage marked USQMC US military dinnerware

Lot of six big heavy plain white ironstone saucers, most marked USQMC (one dated 1939, five dated 1941, one without date marked only Shenango China). These are 7" in diameter, big as salad plates.

All six of these have noticeable wear, and one of the 1941s has a star hairline crack. Most look very close but I don't think they're exact matches - not surprising when you think of the thousands and thousands of pieces of china that must have been in service. Pun intended!