I've just referenced the "Fregosi Emerald" in a bounty on this question. Unfortunately I mipselled it as "Fergosi" and bounty comments can not be edited.
In The Munsters S02E21, Grandpa visits the last living Fregosi descendant who works for Amalgamated Motors in Detroit, putting evil curses on cars manufactured by the competing auto manufacturers also in Detroit (thought the view of the hills from Mr. Fregosi's window looks more like LA than Dearborn).
I was surprised to hear Grandpa refer to himself as "Dracula" more than once, including when he called back to Transylvania for directory assistance.
While of course the show is full of references to Grandpa being a vampire, I'd never heard of him as being The Count Dracula before. Is this a one-time reference, or was this a more standard part of in-universe Munster history?
The episode is partially viewable at http://www.dailymotion.com/video/x53mae6 where Grandpa makes his call to Transylvania after
15:10 and says "My name is Count Dracula", to which the operator replies "You once bit my grandmother!" Also, after
18:30 Mr. Fregosi says "Dracula is an unusual name." to which Grandpa replies "It's Transylvanian!"