This is a Takahashi Tube Holder for mounting an FS102 (or FS106) to a Televue Gibraltar Mount. I used this to mount my FS102 to the older style Gibraltar mount (see my other ad). Works great, and is still in very good shape. The felt lining is as good as new and there are only a few scratches in the metal from attaching and removing the holder.
This sells new now for $189. I will sell mine for $135, including shipping to the continental USA (only).
I will accept PayPal, cashier's checks or money orders only for payment.