[perezfan]

My take...

Richie's Ball is definitely hand-signed.

William's ball is stamped. The only overlap occurs where a dark blue sig overlaps a light blue sig. So I think the ball was stamped in two separate instances (once with dark blue ink and once with light blue). There is no ovelap of names with common-color ink.

Perhaps they had not yet perfected the art of stamping these balls yet, since this is such an early example. Regardless, there's no way those names were hand-written, IMO.