dscc5638.jpg

Detail of the markings on two of the tubes (visible at upper-right in dscc5631.jpg).

The center tube appears to read

308552-200 "E"
PS885-22
S/N-103-99

The tube on the right appears to read

308552-200 "E" [although the '8' is too blurred to clearly discern]
PS885-22
S/N-103-100

Both tubes have what appears to be an inspection stamp, a circle divided into four quarters, with "RW" in the top quarter and "210" in the lower.