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Charger, Road Runner, & Super Bee Authentic Restoration Guide written by Paul Herd page 95 states, Master Cylinders 1968 "The cylinder itself should be painted cast-iron gray to simulate the fresh-cast look, and the cover and hold down clamp should have cadmium gold appearance. Page 95 goes onto state The Federally-Mandated dual circuit cylinder first appeared on 1967 models. Both 67 & 68 used Part number 2808599. Chrysler Muscle Car Parts Interchange Manual written by Paul Herd page 85 shows part number 2808599 applicable to 1967-69 Barracuda, Fury, Monaco, Newport, New Yorker, and Polara. 1967 - 68 Belvedere, Charger, and Coronet, with drum brakes. Used in both power and non-power assisted applications.

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2808599 is a drum brake master cylinder. 67-70 drum brake Mopars all used the same master cylinder and it had the bolt on style cap. Generally accepted to be cast iron with plated cap, though I have NOS examples that have the body E coated black with a plated cap.
The OP asked about a disc brake master cylinder. All the Mopar disc brake master cylinders from '67-'70 were painted gloss black except the flange and the area by the outlets where protective plugs were installed prior to painting. Here is an NOS assembly line '67-'70 A body manual disc brake master cylinder casting number 2225541 date coded 212th day of '69. Interestingly has a splotch of white paint on the front of the bore area of the casting.

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