As with all my M2M sales, I sell for what I paid (or slightly below, depending on condition)
For the 253, iirc that was €300.
My reasoning, I got a good deal on it and passed it onto a great guy.
Am a huge believer in karma & regardless of it's rarity, if I get something for X I don't think it's right to charge 1cent above what it cost.
And most times with rare items, I will offer first refusal back to the original seller, I think that's only fair too.
Zero profiteering is one of the core principles of the RWI M2M sales area & part of what makes me very proud to be a member here.