Hi Helen and a very warm welcome to WTF,
I am also a proud owner of a DeVille Jumping Hour.
I have done some research on this rare timepiece and was never able to find out the actual numbers that were produced. It wasn't a limited edition watch. However, it was only made for about one year so numbers will be more limited than normal. Omega produce
more than 2000 watches per day so I would think that there are more than 2000 Jumping Hours out there. However, there are a few different versions including stainless steel and gold versions and bracelet and strap versions. So, maybe, just maybe, there is only about 2000 of your particular model.
As for value. I haven't got a clue. These are so rare that you are only the second other person I know that owns one, and I have searched the internet.
The 18ct gold version on a leather strap (the version I own, see below) was £2200 when it was sold new.
Sorry I couldn't be more helpful but you have a rarety there and as such information is limited.
May I ask if you have any other interesting timepieces?