Vintage Omega Watch- 70s. Any idea?

[maxwaffles]

Hello,

My grandfather gave me this omega watch. I brought it to the Omega store and they couldn't identify it. I was hoping someone here could. I posted on a Omega forum before I was told this is a reference D6672. I have also been told it utilizes a caliber 620 17 jewel movement. The back of the case reads 14k gold.

Any ideas? Worth restoring or is there no value? Any insight would be much appreciated.

thanks in advance.