That's the Chrysler-made TSB cap, rev.1.
The original cap in '60 was # 1889 424. Black bakelite with the "Forward Look" emblem cast into the top, aluminum contacts about 9/32" wide. Used with conventional rotor. There was a TSB in late '62 to address a hard-start condition caused by crossfire under the cap and a "possible" cap material porosity problem allowing the cap to get effectively waterlogged, aggravating the crossfire problem, as well as the possibility of high voltage leakage from the coil-to-cap cable.
Parts package # 2448 273 contained:
-a new cap #2098 765, black bakelite (presumably not porous), aluminum contacts about 1/2" wide
-a new rotor #2098 770, green-brown bakelite, longer contact w/necked-down (narrower) cap end
-a new coil-to-cap cable with better boots on both ends.
Later, the #2098 765 black bakelite cap was supplanted by #2444 690, same cap but in tan alkyd for even better resistance to arcover underneath. The same rotor #2098 765 was used with this tan cap.
These parts were used through '65 as factory production items. Oddly, the final-revision '65 FPC calls out #2098 765 for some distributors, and #2444 690 for others. The only difference is black bakelite vs. tan alkyd material. :shrug:
For '66, the wide-segment cap was superseded by #2642 986, tan alkyd with aluminum contacts about 9/32" wide (same width as the original '60 cap), used with the original ordinary rotor (without extended/necked-down contact). I guess the upgraded material was good enough to prevent arcover and the narrower contacts were probably cheaper to make.
The aftermarket did cover this wide-contact cap; it was a NAPA Echlin MO-6, for example, and I think Echlin also offered the special rotor, perhaps as an MO-7. Long since discontinued. Never seen one (nor evidence of one) with brass or copper contacts, only ever aluminum. Too bad; I think the wide contacts are a nice idea for minimising under-cap arc-and-spark action. I have one of these (an MO-6) on my '71 Dart at the moment.
Betchya didn't think I knew how to rock 'n' roll... 
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