Formal 436 (a.k.a. Oscar).

Aha! Also, many thanks for the tidbit of the aka name Oscar. It was originally an Aldo Novarese design! I just knew it was good!
I saw it used as the caption font on the Fox News late night comedy chat show "Red Eye", The shots I took off the tv screen are here:
http://www.dazeofourlives.com/CaptionFont1.jpg
http://www.dazeofourlives.com/CaptionFont2.jpg

No shots of the lower case, but when I saw that used in the tv show's captions it only served to make me more interested to find out what font it was.

Again - thank you Mark!