What is a Forehand Arms 32 caliber six shot revolver Pat'd Dec 7 86 Jan 1 87 with FW on the grips worth?

Doing some research myself on this subject and have only been able to determine that the company was named Forehand from 1890 to 1902. It had originally been named Forehand & Wadsworth, and was renamed when Wadsworth retired. It was sold be the family in 1902 to Hopkins & Allen. Sorry this only gives a rough date, but so far this is all I have found. The first answer narrows the date of manufacture down to a 13 year period, and that is a pretty small window for an old gun. All I can add is that if they were still using leftover F&W grips, it was probably made fairly early in this period. Unfortunately, this is not enough to get an antique designation from the ATF since the model was still being made after 12/31/1898 and there are no records to prove which side of that arbitrary date yours was manufactured.