Just wondering if die chips have any value? And if a 1981 lincoln cent with a filled 9 would be worth anything. I know it was common in the 50s but what about 80s?
No... Unless is slabbed, then you can sell it for whatever price you want! Such as - https://www.cointalk.com/threads/ngc-die-chip-label-first-ive-seen-this.294452/
The only way these type of varieties/errors ever seem to gain any sort of substantial premium is when they occur in some sort of grandiose manner- such as "spitting eagle" or "stabbed bison". Even then, you should be ready to sell when they become popular because they are not especially rare. Once it is observed there is a demand, the market tends to be quickly flooded with comparable coins. Die chips inside the numerals/letters is very very very common towards the end of die's life.
Very little value individually, but grouped together as a lot of 20 I can get $9.99 for them on Ebay, no hype, no false descriptions, etc. They can be useful learning tools and go good at give away's at coin club meetings. I've never gotten a bad feedback for them.
Folks were collecting these back in the 1960s and 70s. It didn't take long for people to learn the actual worth and the search almost ended. I still saved 50 or so rolls of them just because of the fun I had collecting them. The term oddities was popular in those days. Collect them for the fun and not the value.
If you want a doable challenge, fill your Lincoln Cent Dansco with "BIE" die chips for the entire 1950s.