Found this info on your gun on the Gunbroker.com Forums (Gunbroker is a firearms related auction site, and has a forum for firearms also):
EIG was the name of the American firm who imported and distributed the first revolver your inquiring about. It was made in what was then Western Germany, probably by a company named Rohm. They were sold very inexpensively at that time, circa 1960's. It's value would still be only marginal today.
I'm still trying to dig up some more detail for you, or to at least verify that the above quote is accurate....
Also found a a completed auction from a couple months ago on Gunbroker where one of these sold.Looking at the price guns sell for on auction sites will usually give you a rough estimate on the actual market value of a gun.This one sold for $100.
http://www.gunbroker.com/auction/ViewItem.asp?Item=103266862
OK, also found a thread on this forum from 2006 about one of these guns. Pay special attention to what Jim Keenan says.He is one of our very respected, resident experts on guns, especially the more unkown, unusual, old, etc. I'm inclined to trust what says to be pretty accurate.
http://www.thehighroad.org/showthread.php?t=192956
Hope this info helps out.
Oh, forgot to add, that as far as having the serial number checked, the only real way to do that is to ask your local police to check it for you.There is no database of stolen guns or anything that is accessable by phone, or on the internet, for people to check.Law enforcemet can run a check through thier database, but thats about it.