It's a Columbian Vise & Manufacturing Co. model no. 804 steel welded vise, briefly available from (1947-1950). It was considered to be a strong and reliable homeowners vise and possibly the first steel welded vise.
The vise was designed and constructed in conjunction with the Parsons Engineering Corp. of Cleveland, Ohio. The following article goes into great detail about the; construction, materials and manufacturing process of the vise.
Although many thousands of these vises were produced, there aren't too many available anymore. The GJ members who do own them seem to be big fans of the vise though, with one of them duplicating the original vise sticker and having them produced for others. The original vises were painted bright red, as seen in the example below by GJ member
"Mr. Wonderful".
El Bicho Malo...Your vise restoration turned out perfect and I'm sure your Grandfather would be very proud.