heres a tip for ya, i just bought this cheaply ( i hope) off ebay because it was just listed as an f type adjustable
i hope you guys will tell me that this is a bit of a rarity...if not ..who ccares ,i like it :)

They often sell for good money. Not especially rare, but desirable.

Nice adjustable " F " Wrench  Benjy,   Here are the ones I've found so far