Craigs Optics 60-300mm MC f/4-5.6 Macro (1:4). Identical to one the Promaster versions and very similar to one of the Soligor versions (different focus grip, otherwise seems identical). A German reviewer says it's made by Kiron, Dyxum forums mentions Cosina as the maker.
Not bad at all, considering I paid $22.01 for it + posting...
MFD @300mm:
Around 100mm
300mm wide open (camera registers f4 throughout the range for some reason)
300mm stopped down to f/8 (camera shows it wide open but I know it's at f8... I'm sure I had camera shake on this one.