I suppose the head could have been a full port/polish one, in which case it could be worth about £800 if in good condition. If it needed guides/seats and a grind, then probably still worth £500.
The problem is it could just as well have been a simple high compression head with the plate rivited. In that case I would have thought £20 for a buggered one would be fair. Getting a head planed is pretty damn cheap (About NZD20 last time I had one done).
Oh well, happy the guy made some money from it. Hopefully someone is happy with the head they bought.
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