Ok. I mean they are asking for $100 for it, do you think that's fair? If I can get the fuse bit to work, the guy said it works.
First, you're apparently in Ireland and what's reasonable in one geographic area may not be reasonable in another.
Second, "the guy says it works" but without the fuse, neither you nor he really knows.
Third, there is some hardware that may be missing, though not absolutely essential. I don't see the holddown brackets in the photo. Also, and more importantly, there should be an extension for the condenser stage shaft.
Fourth, if it was here in the US, I'd say the price is high. I sold a the later version of that head (with internal power supply) for $50 and thought that was reasonable. I have a complete 23cIII here with colorhead that I'd sell for $150 (you always wanted to visit Minnesota, haven't you).
I have the manual for that colorhead if you want it. I'm sure it's available online.