I think different people will have different value, but for me, max at $100, and also it must be in good shape and guaranteed working.
Btw, at eBay, the popular Tek 2465B 400Mhz is hovering with offering prices about $350 to $400, I think this a fair base price for comparison with 2225, imho.
Btw, that item at the crt bezel has few cracked or chipped parts, watch closely at the photo.