Thank you all for your comments on my sugar creamer set post of yesterday.
Vonlipi steered me in the right direction by pointing out that the L stood for Libbey glass. From there, a little research revealed that this is from a line called Libbey Rock Sharpe (Rock Sharpe was a co. that Libbey acquired), and the pattern is aqua pinecone. I'm still trying to determine the year this pattern was issued. I'm guesstimating in the 40's?
I have seen coffee cups and drinking glasses in the same pattern on Ebay and such.
And then Vintage Christine posted about her wonderful matching coffee carafe over at her blog, a sight to behold!
We should get our glassware together and have a coffee break!