I took the first photo, turned it upside down then viewed it on a 4K tv, to two of us it looked like the lettering says OK 63 30 on the top electrode. you can even see it on this capture.
View attachment 253315
I took the first photo, turned it upside down then viewed it on a 4K tv, to two of us it looked like the lettering says OK 63 30 on the top electrode. you can even see it on this capture.
View attachment 253315