Sorry about the huge pic. Here it is again.

Challenge Extra Bold .... from the memory banks !!

EDIT: I'm a slug compared to others. I knew that from days of old, when letters came on things called transfer sheets ;-)

it must be Challenge Bold by Martin Wait
Check also the alternate cuts offered by Letraset, Linotype, Agfa & Elsner+Flake as there are minor differences between them and some cut may fit your design better than others.

Edit: Adydog is faster than light ;)

Your memory is AWESOME! Thank you so much. I really appreciate it!