grand rapids bookshelf and chair co - chair

Found this chair in an estate sale.  liked the shape, seems to be in good condition.  tried looking online for information, found some about the maker, but nothing specifically on this chair.  Would like to know the time frame inwhich it was made and a possible value.  We paid $30 for it.  I have a wood working background, i can tell its made of oak, some if not all quartersawn.  Looks to be mortise and tennion construction,  It has a label with a number under the seat (will include a pic).  label states "Life Time furniture, grand rapids bookcase and chair company no. 73642

Fair