OMG be careful, thats an early model cyberman. It took Dr Who a while before he figured out how to kill them.
Seriously, that machine is so vintage that Id be surprised if you found anyone with the kind of experience youre seeking. It will certainly make a great conversation piece. How on earth did you find such a beastie in the US? Most of those machines would have stayed in Italy, France, Spain region well before the rest of the world discovered espresso...