YOU ARE LOOKING AT A VERY RARE ANTIQUE, PRIMITIVE TOOL FOR MEASURING ROPE.
PARTS DO MOVE, BUT I IMAGINE THAT THIS WOULD BE MORE FOR A SHOW PIECE.
IT'S PRETTY COOL!
IT IS HEAVY (AROUND 25 LBS.)
IT IS MADE BY MARVEL RACK MFG. CO, IN MINNEAPOLIS, MINNESOTA U.S.A.
ON ONE OF THE DIALS IT SAYS--APPROVED BY DIRECTOR OF STANDARDS FOR MASSACHUSETTS PAT. PENDING.
IT IS MOUNTED WITH TWO BOLTS ON AN OLD BOARD, WHICH HAS SPLIT AND HAS A SLICE OF THE WOOD BROKEN OFF. SEE PIC