Descriptions :
OMEGA Stainless Steel Speedmaster (No Crown Guard) early 3-Reg. Chronograph "Ref. 105-012-66" (4th / 5th Generation) Circa 1966.
Dial :
Signed and original black vintage Pre-Moon Speedmaster dial with Applied Omega Logo at 12:00 appears to be in good / excellent condition with only minor light aging at luminous hour markings. Plastic original crystal appears to be in MINT condition with no visible scratch and is signed with a small Omega logo in the center. Original hands are all in fairly good condition.
Case :
Signed and original SS case appears to be in fairly good condition with minor light / fine scratches from wear. Lightly polished. Signed and original crown and pushers appears to be in fairly good condition. Original black bezel appears to have been aged with some lightening in colour but overall appears to be very visible. Screw back cover signed with Ref.105-012/66 on the inside appears to be in fairly good condition with a few minor light open marks as shown on scan. Inner dust cover attached.

Size Measured = 39mm without lugs and crown.

Movement :
Signed and original 17 Jewels Cal.321 manual wind movement appears to be in nice and clean condition with movt no. : 24954xxx.
Remarks :
Watch do runs well and keeps good time. All chronograph function START / STOP / RESET well. 

Note :

The only small common problem that I have noticed is that the reset spring is not stiff enough to hold the HOUR Chrono hand in position, although it does RESET well, yet the chrono hour hand will run on it's own (Very common problem with Cal.321 movement that can be fixed by repairer.