This same whip was sold though the Profiles in History movie memorabilia auction a couple weeks ago,
http://www.profilesinhistory.com/items/hollywood-memorabilia-auction-40/antonio-banderas-hero-“alejandro-murrieta”-bullwhip-from-the-mask-of-zorro.html
Though COA’s can easily be faked and often are, apparently this whip had credentials and was sold along with several other props & costume items from the Mask of Zorro film. It only received one bid though and sold for $2000. Apparently now the buyer is trying to resell it for $5,500 and make a bit of a profit.
David Morgan supplied several of these #450 series bullwhips in black to the Mask of Zorro production, to me this looks like one of the bullwhips David made. I don't know if Joe Strain was visiting David around the time these whips where made, or if he had a hand in them (Maybe he can comment to clarify) but the information on the Bullwhip FAQ is somewhat exaggerated. Joe Strain was never really an "apprentice" to David, however; Joe did make whips for the Mask of Zorro film. These where whips made for Alex Green, the films stunt man & whip coach and where the whips used by Anthony Hopkins in for the candle-snuffing scene. They where a longer handle whip with a silver ring fitted on the handle, a forerunner to the Official Zorro whips Western Stage Props sells now.
This is one of those whips Joe Strain made for the Mask of Zorro that was used in those scenes. This whip was owned by Paul Nolan and the credit for the photo goes to him, but the whip has since been sold. At least one of Joe Strains Indy style bullwhips (currently owned by Gery Deer) also made it into the Mask of Zorro production. It was a 6ft bullwhip purchased from Mark Allen at Western Stage Props. It also has the 7 x 6 Two-Pass turkshead knot (rather then the 5 x 4 three-Pass turkshead knot seen on David’s bullwhips) and is distinctively Joe's work.
Dan