I have a nice vivitar flash unit.. the name plate has fallen off.
On the back it says m/p/o in red letters... does that mean it will work for minolta/pentax/olympus cameras?
it takes 4 AA batteries and has TTL A1 A2 M settings
Should have a guide number slider on the back that will also let you use it manually with almost any camera with a plain old hotshoe or Viv style X-sync chord mount. If it's gone, the guide numbers should be easy enough to figure out.