Yes....MK10 first stage.
If you plan on having it serviced by a shop, unless they give you a really good deal, it would probably not be worth having it rebuilt either to own or sell. However, that is a great regulator and if you plan on doing it yourself, it will be well worth your while......in my awkward way, I'm suggesting either do it yourself and keep it, or clean it up the best you can and sell it.
Here is a link for more info on getting your depth gauge/bottom timer back in service.
Oceanic Datamax II
Couv
ps thanks Aquaregia for watching my back.