This is the Pentax flagship flashgun AF540FGZ including case and manual.
It also comes with an extra: The Pentax off-camera shoe cord and shoe adapter. One end goes on the camera hotshoe, and the other end of the coily cable plugs directly into the flashgun.
Included also are the manual, and the Pentax soft case.
The flash is in good condition and full working order. However the fiddly wee diffuser thing for use at extreme wide settings does not work - but you don't really need that!
I am asking £200 including UK postage.
Pictures attached.