Oldest to newest

Model B Revision 1.0 (256MB)

PCB says: "Raspberry Pi (c) 2011"

Model B Revision 1.0 (ECN0001) (256MB)

Model B Revision 2.0 (256MB)

Model A Revision 2.0 (256MB)

PCB says: "Raspberry Pi (c)2011.12"

Model B Revision 2.0 (512MB)

PCB says: "Raspberry Pi (c)2011.12"

Model B+ Revision 1.0 (512MB)

PCB says: "Raspberry Pi Model B+ V1.2"

Compute Module Revision 1.0 (512MB)

Model A+ Revision 1.0 (512MB)

PCB says: "Raspberry Pi 2 Model A+ V1.1"

Pi 2 Model B Revision 1.1 (1GB)

PCB says: "Raspberry Pi 2 Model B V1.1"