""Is there any other mine that uses the Maruichi stamp as well? I have not really seen any.""
There are no mines who use the Maruichi stamp. Only the retailer Maruichi uses that family stamp. Why would a mine use a stores stamp?
Sorry this is misasked. Are there Maruichi stamped stones that are claimed to have come from different mines?
Thank you for all this information it has been very enlightening.