Here is a 2017 P doubled die. It appears to be doubled on both the obverse & reverse. What do you think? Thanks,
Machine doubling. It does not add any value to the coin As you spend more time on here, pay attention to the links people like paddyman and others post about errors and varieties. These have great explanations and pictures. Looking at a lot of pics helps and over time, you'll pick up knowledge on the minting process. I think I can speak for most of the experienced numismatists on here when I say that we enjoy watching someone learn and grow in the hobby. That's why I take the time to answer question. It's pretty easy to tell when new users are picking things up and when they keep asking similar questions again and again. (When you start getting more short, sarcastic responses than actual help, it's time to do some studying). Keep learning. You may be a YN, but you seem to have a good baseline.
"Machine" or "Mechanical" doubling. A natural occurrence on most dates, denominations, and types of (mostly) modern coins. This type of doubling confuses folks who think it's a rare doubled die error. In the back Appendix of the CPG (CherryPickers Guide to Die Varieties) it explains and shows the difference between a doubled die coin and the other forms of common, and non-error, doubling. Strongly recommended for beginners......
MD ( in the classical sense), but notice many single squeeze modern dies produce a coin such as yours with very similar effect and some collectors call them a Doubled Die.
