I don't think you're gonna find it on the CD mate. The 'Find' function of my OS3.9 found serial.device in these locations:-
AmigaOS3.9:Emergency-Boot/Devs
AmigaOS3.9:OS-Version3.9/Workbench3.5/Devs
AmigaOS3.9:OS-Version3.9/Workbench3.9/Devs
But each of them is version 43.1 with file size 5,288 and date 06/03/00
