Yes, it is certainly worth restoring. First, please get rid of that ugly aftermarket band and have a nice leather band fitted instead. These old Speidels tend to grind the insides of the lugs, particularly when they are rusty like yours.
The cal. 750 movement was a special 17 jewel version made specifically for the US market. Saved Omega a bit on customs, rather than importing the standard 24 jewel cal. 752. Still an excellent movement, but I'm sure yours is in dire need of some TLC. The inside gasket has turned to goo, so the case is going to need a major cleaning.
Not sure where you are located, but there are several good watchmakers that hang out here, and hopefully will see this.
gatorcpa