Wait till you see the matching 4s!
The seemingly original spruce core fingerboard doesn't have much wear, which should answer some of the questions about condition and the violin having been played much or not.
As for the missing bass bar, yes, the plate is just thick instead! Arguably, there is an integrated bass bar without the wood around it being removed. It's a fairly even 45-55mm thick and weighs 101g (yeah, the top).