This doesn't really qualify as a rare model ... It's a rare SE/30 in that there likely only a few thousand manufactured prior to its release in January 1989. But definitely not a rare variant. This is similar to the 1983 128K Macs, rare for the model, but otherwise mass produced in huge numbers, and hardly rare as a model.
You should start another thread though and document the differences between its internals and the more common later SE/30s though to see if it underwent any major production changes from it's launch, like the 128K did, or if it was pretty well thought out before it went into production, unlike the 128K.