Detroit Jewel was a regional company. In other words, you're more likely to find them in the North East than South West. We have a Floyd-Wells, which was made in PA that's the same. I think Detroit Jewel was more popular so parts might be easier to find.
If you look at my blog you can see plenty of pics of my stove, which is about the same era as yours, while I was getting it ready for use. Mainly cleaning it, and adjusting the orifices so it would work with propane instead of natural gas (not all stoves are adjustable). Quite honestly, it's about as simple as it can get. Ours has no options though, the more options, the more things to break and complicate things. It doesn't even have a clock! The standing pilot isn't much of a problem and doesn't seem to "eat" much propane, and the match light oven isn't all that scary either, it works just as it should.
Will you be using the same fuel source as it is currently using? Before we found out ours was adjustable, I hit about 100 brick walls trying to find someone with new orifices!
We have been using the Bengal since we got it plumbed, with only a few issues-like one burner needs more adjustment because it doesn't like to light. There aren't really any "wear" parts, aside from maybe the oven thermostat, so reliability isn't much of an issue. Mostly, I'd see if it's still hooked up and light each burner and the oven. Make sure all the knobs are there and aren't broken, same for the burner grates. One of my burner grates is cracked and I'll be darned if I can find a replacement.
The Cottage Blog: http://eclecticcottage.blogspot.com/
Current home: 1950's Summer Cottage turned year round home (the Cottage)
-@ 700 sq ft, heated with a wood stove, on the shore of Lake Ontario
Previous home: 1920's Vernacular (the Old House)