[Identifying Cornwalls starting with "Z"]

Thanks everyone for the replies. I am a bit hesitant to open them. I might do so after I move them into the new house and I'll update this thread.

[Identifying Cornwalls starting with "Z"]

Hello, 

 

My father left behind a pair of Cornwalls with Serial Z8W351. I can't seem to decipher this number with the info I've found online. I've looked through the pinned post but nothing seems to start with the letter Z. Just trying to figure out how good these are and if I should use them over a modern pair of Klipsch Tower speakers.