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All Series 80 Colts have the "quarter-cock shelf" in place of the captive half-cock notch.
The quarter-cock still stops the hammer from falling in the case of the thumb slipping off the spur, or broken sear, or other mechanical problem.
The S80 system prevents the firing pin from contacting the primer if the hammer does fall (for some reason other than a complete pull of the trigger), so there was no need for the captive notch to prevent hammer movement.
Also, if the hammer does fall from the quarter-cock, it's not moving fast enough to move the firing pin with enough energy to crack a primer, anyway.
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