Received this today via web mail...

The piece of pottery I have is a blue planter with a lamb on it. The bottom is marked USA R.R.P. Co. Roseville Ohio 1306 - 4"

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There really isn't a question there but I suspect that your looking for more info on your lamb?
Other than what I've stated on the website about this pottery company I really don't know much else.

http://www.oldantiquepottery.info/rrpco.htm

Is the picture below the same one as you have? I found it doing an image search on Google. It was from an Ebay listing that has since expired so I don't know what it sold for. (I would guess not allot because they made so much pottery and were in business for so long.) The RRP Co. stuff I come across us usually pretty inexpensive.

Thanks for visiting.