Your responses makes quiet clear that a razor without stamp drops massively in price. Of course: buying such a razor is a gamble. But my my question is about bringing this to a higher level. Is it possible that there are Iwasaki without stamp? Your picture Sharptonn makes it clear that there are acid-etched stamps. And these can be washed.
I don't buy a razor to sell it later. If that is the purpose I agree the stamp is necessary. The quality of the shave is my measure. Then it comes to the point: can I trust the Ebay-seller in his story "Iwasaki no stamp". This seller has only and a lot of positive feedback. An Ebay-seller has to be very keen om this feedback. 10% bad feedback ruins this business. That was for me the reason to try it out.
Part of my hobby :o