Terry, Yes, that is correct. In fact even the earlier post war examples have rivets on the reverse. I think they probably madethe change sometime in the 1970s but I am not sure on this. Since they changed the design of the Sacred Treasure in 2003, adding a pawlonia leaf between the ribbon and planchet, these types with no rivets are actually underrated and comparatively scarce. There are also some poor quality copies that have no rivets on the back but the obverse quality gives it away as a copy. Regards, Paul