Okay, I found this disk in the garbage. Some guy just threw away a box full of disks and drivers.
Well, I can't use them all, but maybe some one here can.
This is listed as
Best Data| MACH 2 56 X 2| INSTALLATion drivers| VERSION 1.0 FOR WIN 95 AND WINDOWS 3.1| COPYRIGHT 1997|
I'm pretty sure that this driver is for a dial up modem. When I copied the drivers to a folder so they could be zipped for transport, they tried to self install.
That's where it said "would you like to install the modem now?"
If it wasn't for that, I would not know what it was.
Good luck and I hope someone gets some use out of it.