Sorry, but the light glare is all over where you circled. It's hard to tell. Also, not sure what you circled on the top part of the B. I don't see that on the reference site. Try using two lights if you have them, so they reduce that glare.
The site referenced by the OP show only the letters E & R. Nothing for that date is listed by Wexler.
Unfortunately, the glare is overwhelming at the moment. Try repositioning the light (top) and soften the lighting with a diffuser (white plastic bag perhaps, but be careful). We should be able to detect notching if it's there.
I didn't reference Wexler 's, I referenced varietyvista, even the link is there. On his list the only blue highlighted year for DDO's in the 80's is the 89 P. If you click on that year and Mint, the E R picture opens in seperate window, the blue highlighted DDO-001 under the picture if you click it takes you to another window where there are 3 more pics.
Isn't it just normal wear and tear from the die? Nothing special? .. I've found plenty like that, or are certain ones rare or something? Also, what's DDO? I thought its DDD? Die Deterioration Doubling
Well yes and no and no. It's Double die obverse or Double die reverse. It's mainly from dies being over used. However, when they match listings from either wexlers or varietyvista listings, they are rare and have value. I'll no expert either. Been learning for a month now. The experts have kicked my ass up and down these forums. They've taught me and pointed me in the right direction just the same. It's a slow process, I'm a Jarhead to boot. So i keep posting dumb newbie errors till i get it right.
John Wexler of Doubleddie and James Wiles/CONECA of variety vista are experts and have been authenticating/verifying errors for years (decades?). Variety Vista is part of CONECA which is an error collecting organization. Chances are, if it's a DD RPM or OMM, it's on that one of those sites
Take some play dough and carefully lay a penny on it until you feel it sink it. Then shift it ever sooooo slightly before backing the penny out. Leaves flat spots next to devices. Take that same penny and again push it into the play dough but this time pull it straight out ....then put it back down into the playdough but rotate it just slightly before pressing it in over the other impression. Carefully remove it. Look at how it appears differently. The devices or details will look thicker and/or be rounded in the same fashion as the device in question...a "doubled" image so to speak not a "slid image".
I'm pretty sure you are aware that we all take a turn on that learning curve. It's not a race unless you make it one, so whatever time it takes...it takes. As learning organisms...we should continue to learn until our last breaths. Learning is living and those that establish pastimes usually keep their faculties sharper. I feel a hobby like ours presents an endless source of new things to learn and explore. Enjoy the ride!