found old nu-grape bottle, help.

[bell47]

I found an old nu-grape bottle like the one pictured here. This is not my bottle, but just like the one I have. I got this pic off ebay. My bottle has Rockland, ME on the bottom. Can anyone tell me when(what years) these bottles like this were made. Was it bottled in Rockland, ME.? Is it worth anything? Best as I can tell they go for about 15 bucks. I'll post a real pic of mine when I get some batteries for my camera.

 

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