Dog Tag Information.
Great Site with all the information on Dog Tag Data you could ever want!
Once you're ready to buy, this link will take you to a great site for repro notched  tags.
Don't wear your tags on an incorrect toilet chain! Get a great reproduction M1940 flat chain. .
One of the basic items of equipment every G.I. reenactor needs is his own dog tags.  Much different than modern tags, WW 2 tags conveyed a tremendous amount of information.  Be sure and check out "Dog Tag History" so you can get squared away for your tag information before you buy.
The 6340 Graphotype was the remarkable machine typically used to create U.S. Dog Tags during the Second World War.
WW2 vintage notched dog tags