This also what I have. But whatdidyousay the way you described yours and the concern about boil over did not make me think of these.
From what mine looks like and the manual that previous owners of this house have passed along to the next owner as this house changed hands several times it is probably from the 1950's. I have had a very few boil overs over the years since I have owned this place and I am sure Fromm the way some other things were that the gal right before me did also. It can be messy to clean up but does not cause any lasting problem.
The only thing I
don't like about mine is that it is from
before self-cleaning ovens. What I
do really like about it is that the oven is at the top and the door swings to the side. Also, to make the oven even easier to get to the cooktop slides in. The burners sit lower than a common range that has the oven under them. Here is an illustration of it taken from the owners manual. The one I have is NOT the "Imperial" model with the extra features.
It would not let me put in the file of my range because I had already used it in another thread!
http://www.alldeaf.com/showthread.php?t=117227&page=7
You need to click on the link to that thread scroll down to post #183 and then click on the illustration at the bottom of the post to see a larger one.
