Shure PE66L in good working order but very well used as can be seen from the pictures!
some blurb I found on the internet
https://content-files.shure.com/KnowledgeBaseFiles/cjrhnpk380syn0189omkw3mwc/1983_20PE_20Professional_20Entertainer_20Series_20Microphones.pdf
Shure PE66L "Professional Entertainer" dynamic microphone in perfect working order... The PE66L is the same mic as the Unidyne III SM57, but it was marketed differently. It's quite similar to the way Electro-Voice marketed their RE series mics as the PL series (RE20=PL20, RE11=PL11, etc.). The mics were exactly the same but with different paint and model names. The same thing is true of the PE66L and the Unidyne III SM57. The spec sheet is exactly the same with the same frequency response (Reverb won't let me attach the link, but if you do a google search for "Shure PE66L", the first result is the spec sheet from Shure's website). The vintage USA made sm57's sound way better than the modern made in Mexico ones. Here's your chance to get a rebranded Unidyne 57 for much less.