Inside, the construction of the cloth layer was also very similar to the Spalding with glue drips and random marks all over the inner surface.  This Ichiban had large dirty circle mark that indicates the ball may have sat inside-out on a very dirty surface for some time.  While this probably does not affect overall play of the ball, it is testimony to the quality of workmanship put into these balls.  Even though the construction of these two balls does differ some what, I would not be surprised if these two balls were constructed at the same factory.