Merrill Chase of Chicago sold both professional and amateur artists, though not all the artists they represented have yet become listed or known. We see many of these pieces here at justanswer. A listed artist means one whose works has re-sold to the public through auction, establishing a collectible secondary market. This piece is by an artist named Silver, of which there is no current listed (known) artist. The numbers on the back relate to a custom framing order and not to the artist.
Unlisted realist floral paintings from the 1960's-1980's of this size carry average estimates of $100 to $250.
If interested in selling your painting, I would suggest contacting Leslie Hindman Auction house in Chicago, where Merrill Chase paintings would have some interest to her bidders http://www.lesliehindman.com/
You could also try Heritage Auctions, who occasionally take on artwork by unlisted artists www.ha.com
Some other, more common sites that I recommend for selling are Varagesale.com, Ioffer.com, OfferUp.com, Ebay and letgo.com.
You can also go to invaluable.com or liveauctioneers.com and search their directory for an auction house near you and consign to them.
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