The caliber number is just under the balance. Can sort of make out a 3. and a 0.
Omega changed the numbering from mm size to the 3 digit code. 30 was a popular size. So 30T is a guess. Has incabloc so PC would also be probable. Center seconds would be SC. My guess would be something like a 30 SC T4 PC which was renumbered to 284.
26x calibers are usually sub seconds.
These are great movements to work on. Not complex at all.
If you do want to take up watchmaking. Get some decent off brand mechanical in tip top shape that keeps time. Will cost around 150 to 300. If you do not like that sort of price then watchmaking is probably not the best hobby.
Individual parts trend around 35 to 80. More often than not they are mislabeled, used and worn out, when aquired through online marketplaces. Takes a bit of learning to risk ordering such.
Most of the value here is in the mid case and back, bezel and crystal. Parts movements are trending around 150 to 250. Which is the price of a new balance and hairspring or balance complete. Fitting a new hairspring is called vibrating and is an advanced skill.
Dials and handsets are another 1 to 300 depending on condition. Which is why it is often cheaper to simply purchase a complete unserviced watch.