Nope.
I haven't seen it yet, and our campus surplus has a rather antiquated website. No pictures and just the following:
OSCILLOSCOPE, HP 5403, SN: US36180581, 60 MHZ, POWERS ON NOT TESTED
It's quite inexpensive, so it might be a good place for me to start, if it's well regarded and will last a while.
It seems like maybe some 54603Bs were labeled 5403 on the face? No idea.
What is a reasonable price for a functioning 54603B? It seems like $30-50 ish?