Here is are pictures of my 15 clone. It says "Electro-Grand" on the machine and the manual, but the underside is clearly marked "Brother". The attachments (very few) were in a Brother box. The warranty in the manual shows the machine was originally purchased April 7, 1953.
[ATTACH=CONFIG]380734[/ATTACH][ATTACH=CONFIG]380736[/ATTACH][ATTACH=CONFIG]380735[/ATTACH]