1999-P New Jersey Quarter- Reverse

I'm not seeing any doubling here. It appears to be MD that you are seeing.

What you are seeing is the enlargement of the devices caused by a die filled with grease. Note the top part of the tapered devices are missing on that area. Probably die die face was cleaned with a cloth, forcing grease into the devices. With this fill, it prevents the top (tapered) of the coin to be missing. So what you are seeing the base of the devices.

The grease can form different ways in the die. Angled, flat or slight. The grease prevents the tapered top area to be seen, preventing the strike on that area. So the more grease, the eventual end could be the devices are missing:

The 80-99 percent ones get a modest premium. The rim proves it was a full strike. A low pressure strike doesn't form a rim:

So while your coin looks interesting, there is no premium for this one. But you might save it for a show and tell coin to show to a new collector.

CoopHome How does grease get into dies? Why does it prevent the normal strike, by leaving it wider? How can I tell a grease strike, from a low pressure strike?