What coild explain all of this is Zenhiro Hattori was said to be the owner of Tenshozan Tanrenjo he also had forges in Osaka,Mishima City ,and ties to Seki city,Takayama forge,and inaba forge.He had established a large network of forges and stores .Some of these forges as you all know had resident Naval inspectors such as the Hattori forge in Osaka.It is no wonder how they could produce 8747 Souvenirs from November 6th 1945 and finish production by March of 1947 .it is said his son inlaw Eiji was instumental in saving many swords after the wars end. This probably explains why there are so many different stamps and as a result the swords were used as surplus. The Hattori Connection.And after all that where were they sold? The Hattori Building. Hmmmmm.