That puts the corvette at 1969, and a model 563, while these often had the plastci name plate, they were still seen with the older stile metal one, as yours does.
The Utiltiy seems to be using the old serial system, which would make sense, as it was made during the change over period, from that i would gues it was one of the earlier ones of 63.
The serials for the Model 2, 2a & 5 are beyond my scope, however Jeffery will be able to give you more details from thise ones when he comes on.
The serial for the self proppelled would make it a 67 model, and as 67 was a crossover, I would need to see it to be able to tell you more, however, here is the image i have,I beleive the 548 is pictured.
![[Linked Image]](https://www.outdoorking-forum.com.au/forum/uploads/usergals/2011/08/full-5013-2977-self.png)