This Lewmar D-2 SAILBOAT LINE CLUTCH has been used, remaining in good condition.  There are many photos showing its details and condition.

  Measures a touch over 6" inches overall.    7  1/2" at the point of maximum handle swing.   For all lines to 7/16"/ 10mm.   Very heavy construction.  Here are some of the Lewmar D-2s features-

Allows controlled release under load
The award winning D2 Rope Clutch allows for an easy and controlled release even at full holding power. Instead of just jamming the rope, the D2 clutch’s Domino Cluster mechanism has a longer holding pattern for better grip and less rope wear. Full holding power is retained regardless of line type used, holding equally well on conventional double braids or Dyneema, Vectran and other modern lines. Fits line sizes from 5/16" (8mm) to 9/16" (14mm). Due to its variable geometry handle and the grip pattern of its dominoes, the D2 provides easy, controlled releases under load without fraying your lines. Aluminum handles and all-metal cam mechanisms.
    Application: High load applications on boats to 55'; Low load and control lines on larger boats
    Max. Working Load: 2650lb.
    Grip: Domino cluster
    Height: 3 3/8"
    Length: 6 1/8"

    Looks quite good, with no traces of bedding compound, etc .  
 This line clutch ran about $140+ at W Marine .  Offered with a low starting bid.