There are markings on these, that once glowed brightly, but now can only be revealed by fire. . . . ok, I kid. . . I'm not an expert on Fuch markings, so I'll just type out some of it.
9113621 15
AS1062
7Jx16
ET 23.3
Ppppppprrrrrrrrrreeeeciousssssssssssssssssses. . .
Thanks for looking!