altec horn

I came across this Altec horn and driver today. I was wondering if anyone knows it's value? The driver works but not sure what model it is. Any help would be greatly appreciated.

This is going to be as close as one can get to a "budget" Altec build considering the skyrocketing prices of classic Altec components. Like a lot of you guys and gals, I have little to no money to throw at these pieces, and the process of assembling them has taken three years of swapping and...