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Question: 
HI STEVE, I am not sure if you answer emails like this, but a friend turned me on to this site, I do not often come across Red Wing, nor Rumrill.. But I enjoyed reading the letters to you and your answers..
Now for what I have, and cannot find out anything for sure..
I have a large planter or console bowl in the shape of a shell. I have attached photos if you want to take a look..
The shell is marked on the bottom with all letter reversed, LLIRMUR U.S.A and the number 505 backwards as well. Beisides the markings being backwards, some one also painted the bottom black, not sure for what reason.. I purchased this at an Country barn an estate of a couple that passed on and were quite well to do.. So did not think it was junk.. Attached see pictures, the dish is about 12″ long..
Thank you for your time.
Sincerely, Rochelle
Answer: That’s an odd one, I have no idea how its marked backwards. Its not a RedWing glaze or shape, so I’m not sure on a value. Thanks, Steve&rose
Information found by submitter later:
As written in RumRill book The Ohio Years 1938-1942
505 shell console bowl Neptune green 1942 Gonder made. 16″ long. $250.-300. They were finished in soft muted shades of green and tan, and their interiors were usually a high gloss pink finish. These large pieces also had an unusual charcoal black bottom—another sign of a Gonder-made RumRill. these unglazed bottoms were also sometimes numbered with a three-digit shape number, starting with the 500 series. These pieces were produced in late 1941 and 1942 at the Zane Pottery Company which later was renamed Gonder Ceramic Arts. Rare ash black bottoms had a distinctive reverse impressed mark. These pieces were made during the transition period when Gonder started producing RumRill Pottery.
Read all about it here complete with pictures..