That's an original equipment Delco distributor. If you plan to continue to use the Pertronix trigger instead of points, let me encourage you to acquire another distributor with points, and an original Delco coil to carry as a backup for the situation of when (not if) the Pertronix takes a dump and strands you in the middle of nowhere. Do a site search and you'll find plenty of anecdotal evidence of the unreliability of those units. If you're running a 12 volt electrical system, swapping to the General Motors HEI distributor is a much more reliable conversion to eliminate the points.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!