I checked - and that is just that run. However ISMACS only show notations for one other "ALUM" run, but that isn't "official" just the notes they have.
It is very uncommon, and likely Singer did make less than 100,000 of them, which is a tiny run for Singer, since they made most machines in the Millions.
As to value - all depends on if there is a collector that has the "hots" for one and is willing to pay through the nose to get one. There are not a lot of collectors willing to pay the big bucks to add to their collection, and most that are, want much older, rarer machines (like SteveH). And then, for it to be worth a lot to a collector, it needs to be in near mint condition.