Depending on the age of your sample, it was probably hand lettered.
This is in the ball park, but there may be something out there closer...

This is Voodoo Script.

I can't find an exact match either, but you may like LHF Ephemera by Tom Kennedy (Letterhead Fonts, 2002)

Really thought I could find it... Anyway, some alternatives: Fan Script, Ballpark Script, Chicago Script