Horological Meandering

Here is a very attractive 1960's diver's watch by a mysterious brand called Delage. I could not find any information about that brand; I am rather surprised because the watch is extremely well-made. Thanks for any info. Here is a picture of it:

 

I looked Delage up in my Pritchard and didn't find a thing.  Given that she is quite comprehensive, could it be possible that the watch dates from after 1975 (the cutoff for Pritchard)?

 

Regards,

Alex

Ever hear of Esiba? I have an Esiba diver probably from the same era as your Delage. It's very well made and has an excellent Felsa Bidynator movement, but I've never been able to find any discussion of the brand. So it goes.

... You're sure you're not making this up?