Okay, I think I've figured out the ID. Thanks to anyone who has been working on the problem.
Anyway, the font appears to be Bernhard Tango. However, it is not the normal and somewhat elegant light weight. The "T" has been stroked a tad and the remaining lowercase letters have been artifically boldened further. The logic of why this was done escapes me.
I'm going to use the normal weight on the sign layout. Hopefully the customer won't insist on having that weight altered.