"ELG" is the Liege (Belgium) proof mark.
If this is a typical "Bulldog" or other vastly-produced Liege firearm, chances are you'll never identify the maker, because these were made by small shops, anonymously. Some were made in small shops from pieces parts made in even smaller shops.
A picture would help.
PS There is a great new book on the subject of Bulldogs (which yours sounds like).
Author, NEW! The M1911 Complete Owner's Guide
The M14 and M1 Garand Complete Assembly Guides
The M1 Garand Complete Assembly Guide
The AR-15 Complete Assembly and (New 4th Edition) Owner's Guides