I believe the ClassID property should still be unique even if there isn't a VI Server class type for it.
"Terminal.Data Type" property appears to work.
Saying "Thanks that fixed it" or "Thanks that answers my question" and not giving a Kudo or Marked Solution, is like telling your waiter they did a great job and not leaving a tip. Please, tip your waiters.
The class ID (16386) is not unique to pictures. I now have 3 ways to check:
The cast to Picture VI Server class is a really interesting solution. I would have never thought to even try that.