Crystal radio kit, need some help figuring out how it works

[vortalexfan]

Hello everyone, today my uncle brought down with him from Michigan where he lives an old Crystal kit Radio that he and his uncle (who passed away back in the late 1970s) had built together shortly before he passed away, and I'm trying to see if I can get it going for him again, it has what appears to be an old Germaniun signal diode in the radio's circuit (that acts as the "crystal" in the circuit) and the diode is unfortunately dead, and also I can't seem to figure out how the set is supposed to get power (what type of battery and what the voltage should be.)

If any of you guys recognize the radio design (if it was a design from something like an old Radio Shack magazine or some other electronics magazine from that time period) then it would be much appreciated if you could share any information with me about how this radio is supposed to work and what kinds of signal diodes could be used in this radio and what I could used as a power source if one is needed.

See Pictures below.