dont know, but 30+ years ago walking by Sam Ash in NYC they had an 100% brass guitar in the window
with a sign that said ,"if you're into heavy metal try this guitar, it weighs 120 lbs!"

I was a teen at the time so my guitar playing skill wasn't honed yet and at the time I was only 25 lbs more than the guitar so I didn't try it

never seen anything like it since, btw- it was a strat style