Vintage M9 knife Pat. 4821356 (Charles A. Finn inventor) made in USA (lot#9658)

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Vintage M9 knife Pat. 4821356 (Charles A. Finn inventor) made in USA (lot#9658):
$999.95

please check all pics, I did not want to sell this knife, I was hoping to get some help on the value of the item, and history, Icould not find another one like it , when you plug in the pat. date, is says that the pat. was applied in 1987, and was given to Phrobis III LTD, it gives the inventors name (Charles A. Finn, andthe assignee Phrobis III) however Icould not findanything on the stamp, all the knives on line have either Phrobis III or Buck, if someonecould help me out on this item I would really appreciated, (not a beauty scuffs scratches rust spots, needs a goodcleaning)
***signature confirmation is required whenshipped due to thevalueof the item