"9/29/63 To my friend Bart, whether he reads it or not—Tom." Bart, the father of the present consignor, worked with Pynchon at Boeing in the early 1960s. Although thirty first editions of V., including advance reading copies, are recorded in American Book Prices Current, only one of those was signed by the notoriously reclusive Pynchon.
pynchonoid notes that Sotheby's characterization, "notoriously reclusive," is one with which Pynchon would likely disagree, based on his past public statement re the r-word. Thanks to a pynchon-l participant for the heads-up.