I've decided to do a full inventory on my coins and currency as I'm going to liquidate most of them and I found this 1974 Lincoln cent with a 180º rotated die. I can't find any real information on it as a known error and it is not listed in Strike It Rich, so not sure what to do with it. Suggestions please. It weighs 2.8 g, diameter 18.9, thickness 1.6, non magnetic.
It is a rotated die error like you stated. And a cool one at that. I've not found one in all of my searches. Forget about "Strike It Rich" that book is junk IMO. You can take a look at ebay recent sales of rotated die cents to get a baseline of what it is perhaps worth.
The only ones I found on eBay are a slight rotation and under $10, so guess it's not worth having it graded.