I have a few things I'd like to share about glass

1. When looking for that nice peice of glass, do a search, look at the going prices.
2. If the listing says nothing about chips, cracks, or missing parts... ASK  pre bid.
3. If you see Glass you would like while out, get as much info as you can, then come to EBay and get a GREAT deal.
4. Always check your S & H charges, pre bidding.
5. When selling, disclose all known flaws, even if you find one after the auction ends while you are packing, contact your buyer and let them know, because it's the right thing to do.
6. Pack extra well.
7. Reading Feedback of a seller that you are thinking of dealing with, helps.
8. READ all the item info, twice, then bid.
9. Glass, for the most part is heavy, Please keep this in mind.
10. Watching an item is helpful as you can track the bidding.
11. An on line photo album that can be sent to a buyer is a handy item to have for your buyer / watcher.
12. Post questions asked, as others may have the same question.
13. Look for a line in center of item, this is most likely a press line.
14. BUY Insurance and ask seller to save the post tag untill your item is safe in your hands.
15. Some newer glass that is painted may contain lead.
16. Fenton sometimes, if your lucky, has sticker type labels, leave these on as to show buyers that you have a true Fenton.
17. Goo-Off can get almost any sticky mess off glass.
18. Water softener cuts grease very well if you find an item that seems sticky from old Kitchen display or use.
19. Sudden temp changes are not the best thing for glass.
20. Hot Water + Cold Glass = no good !! Same for Hot Glass + Cold Water.
21. Let your glass cool down after washing.
22. Mind how and where you store glass.
23. If your having a party, keep your ice away from where you keep your glass,USE a scoop! Keep scoop out of ice when not in use.
24.  If you should happen to break a glass in or near the ice, PLEASE DUMP ICE and get new.
25. Some colored glass is "tinted" look for scrape, scratch, or chips.
26. Cut glass I have found to be heavy and the "cut" parts are sharp to the touch.
27. As I learn, I share. More to come, Please rate this guide :o)

** Answer to Question**

Cant get the mail to work so I hope you come back to here, also reposted on ME page...

Hi,
What fair?? Have you looked in any Antique shops?? The sellers might give you a clue. If they should offer you any money KEEP YOUR LAMP!!  It will then be time to get a pro to set a proper value on the lamp. You might want to put a pic on EBay Blog and ask the world for a bit of help :o) Also I dig this up on the web

M......................Maryland Glass Corporation, Baltimore, MD. (1907-c.1970s). Exact period of use uncertain, but verified on base of cobalt "Milk of Magnesia" bottle from circa 1950 (see next entry). Also, a similar mark is known on the base of mouth-blown amber beer bottles and an amber salve jar, c.1885-1895, and the maker in those cases is unknown. In some cases this may be the mark of the Mosser Glass Company (1971-to date), which of course is a much more recent mark.
M in a circle.........Maryland Glass Corporation, Baltimore, MD (1907-c.1970s). Mark first used in 1921, according to trademark info reported in Peterson's 400 Trademarks on Glass (1968). This company specialized in cobalt blue glass bottles and jars. Many of the containers made for Phillips Milk of Magnesia, Bromo-Seltzer, Vicks, Noxema, etc, were produced here. Maryland also produced the most commonly seen type of "violin bottle" in various shades of blue (and probably other colors). Maryland Glass was acquired by the Dorsey Corporation in 1968, and I believe that the "M" mark was discontinued sometime in the early 1970s. Anyone with info, please contact me on how late this mark was used. Note: The "M in a circle" mark has also been used more recently by the Mosser Glass Company (Cambridge, OH, 1971-to date), but in those cases it is usually found on tableware, novelties, toothpick holders, etc.
M in a diamond.........Unknown (Seen on base of clear prescription bottle, c.1890)
M in a hexagon.........Metro Glass Bottle Company, Jersey City, NJ. Mark used c.1949-c.1981. Also with plants at Washington, PA (since 1957)
Hope this helps :o)