For your consideration is this vintage 1966 Omega Speedmaster ref: 105.012-65 
Serial: 24.01X.XXX

Dial: "Narrow T" applied logo dial in very good condition. Tritium plots are in good shape and have aged to an Olive Green shade, plots show some degradation and discoloration.
Hands: Original Tritium hours & minute hands in good shape. The original Chrono hand has been repainted and re-lumed.
Case: 'HF' asymmetrical case. Appears unpolished. Lugs are thick and even with sharp edges. Case shows some wear, (Please refer to pictures).
Crown & pushers: Original Fat Neck pushers. Service crown.
Bezel: Very nice "DON" (Dot Over Ninety) TACHYMETRE bezel in good condition. Shows wear as shown in pictures.
Bracelet: None.
Movement: Omega Cal 321. Watch is running. Chronograph & subdial hands reset to 12. No known recent service history.
Accessories: None.

Notes: Overall a very nice example of a Cal 321. 105.012-65 Speedmaster Professional with DON bezel that will not break the bank!