sorry for my ignorance but should it also have numbers representing the strap, dial colour and markers?
No, the strap, dial and markers are not indicated on the case reference because the same case can be used with all the different dial and strap options. The purpose of the case reference code is to make it easy for watchmakers to order case parts. In this situation the only parts that matter are the bezel, back, and crystal. For that, the listed numbers are meaningful. Marking the case with the type of strap would open up a logistical nightmare since they'd have to stock the same case under several different numbers only to cover strap and dial options, when the same case is interchangeable with other straps and dials. The zero at the end of the case reference number is a period of sorts, making it clear that it's not the same as the catalog number for the complete watch. It refers only to the case.
Adding to BlueHawaii's comments on earlier versions of the reissued Ventura, the 1988 release also included a rose gold with black dial version.
The various dial options changed through the 90s, not all were available at the same time. The black (actually matte 'charcoal') dial with yellow was dropped fairly early, leaving only silver dial with the yellow case. Later the yellow was dropped completely, as was the rose.
There were several other changes along the way. The very first reissues had a snap-off back made of gold-plated base metal, with a round stainless piece in the center of the back. This back did not hold up well. After snapping off and back on a number of times it no longer holds anymore. It eventually becomes impossible to close it, rendering the watch unwearable. One other serious problem is that many watchmakers or owners failed to notice the small arrow with "open" point to the edge where it should be snapped open. Instead, they figured the stainless disk on the back should come off to access the battery. That resulted in a lot of seriously damaged watches as people would aggressively pry off that disk, which was then not replaceable anymore.
They changed to a back held in place with 3 screws. That solved the snap-on problem but not the wear issue: they were extremely prone to wearing out along the edges. And some people ignored the screws and continued to pry off the stainless disk, ruining the back.
In the mid-late 90s they changed the back to a thin all-stainless one, with no domed center as on earlier ones. That was much less prone to wear or damage, but the bezel still tended to wear or flake.
It was right around 2000 that they went to all-stainless, which was a huge improvement. At that time they changed the dial from domed to flat, sitting lower in the case.
The more recent Anniversary and Elvis editions have completely redesigned cases that are much closer to the original in shape, and also have domed dials more like the original. They look more authentic than the 'standard' Ventura reissue.
Parts for any of the 1990s Venturas are no longer available, and aside from the hands there are no parts that interchange from modern Venturas to any of the older incarnations. Restoring a worn or damaged 1990s Ventura has become impossible. Not even crystals can be obtained anymore.
EDIT: Here's a picture of the back of a rose Ventura I bought in 1988. You can see the faint "OPEN" at the lower right. Most people just pried on the center disk until they'd finally break it off. Or, if not manage to remove it, at least to gouge the back so horrifically that it was pretty much ruined.