The ROM daughterboards for the two Leapster 2s had slightly different silkscreening: 20055+003+1004 with a datecode of 0619 and 20055+003+1006 with a datecode of 0652. I dumped both of them and they are quite a bit different; there's a lot less empty space in the 1006 version. The latest date I found in the 1004 file is Aug 30 2005, and in the 1006 file is Oct 21 2005.
Edit: are these Leapster 2s or Leapsters? The datacodes make me think they are too early for Leapster 2s.
I also cleaned up some other dies looking for part numbers. There's no info or logo on the Sensible Soccer die. The Grandstand Game Player just has the part # 1C5738 and ID of 1645, no company name or logo. Skateboarder is a Sunplus QL8041C. The Cube World Block Bash small die is a Winbond SA5623 and the big die is a Sunplus QL6045.
Skannerz has a Winbond SA5621. Radica 20Q has a Sunplus PL6413.
