Sony Vaio C1 series
The Vaio C1 PictureBook series is a series of subnotebooks from Sony's Vaio brand, branded 'Picturebook' for its webcam and video capture capabilities. It was first released on September 19, 1998, in Japan only.

The first model, the PCG-C1, featured a Mobile Pentium MMX 233MHz CPU, integrated modem, 3.2GB hard disk, 64MB of RAM, an ultra-wide 8.9" 1024x480 TFT display, and a 0.27MP webcam. Windows 98 was installed. Subsequent revisions improved the resolution, CPU, RAM and hard drive. PictureBooks were lightweight computers, weighing 1kg.

The successor model, the PCG-C1X, came with an upgraded 266MHz CPU and 8.1GB hard drive.  This model was the first one available in the U.S.

Also the PCG-C1F, the PCG-C1R and the PCG-C1S had the same hardware, but they are localized for the U.K. and the later 2 for Japan.

Further models were:

PCG-C1XN - 12GB hard drive, 64MB RAM, 233MHz Intel Celeron, Windows 98 (January 2000).
PCG-C1XS - 12GB hard drive, 64MB RAM, 400MHz Pentium 2, Windows 98 (January 2000).
PCG-C1XD - Same as the C1XS, but with German localization.
PCG-C1VN - first machine with Transmeta Crusoe CPU - TM5600 600MHz CPU, 128MB RAM, 12GB hard drive, ATI Rage Mobility 8MB, Windows ME (September 2000)
PCG-C1VE - same as C1VN (September 2000)
PCG-C1VP - same as C1VN, except Crusoe TM5600 667MHz CPU, 15GB hard drive, Windows 2000 Professional option (March 2001)
PCG-C1VFK - same as C1VP, First Model with integrated Bluetooth 1.0 Adapter, Windows 2000 Pro (March 2001)
PCG-C1VSX - same as C1VP, except choice of 15 or 30GB hard drive, no external monitor support and Bluetooth 1.0 and Windows 2000 Pro only
PCG-C1VS/BW - same as C1VSX, except Crusoe 600MHz, 15GB hard drive, included PC Card CD-RW drive, support for external monitors, no Bluetooth and Windows ME only with Office XP preinstalled
PCG-C1MV - Crusoe TM5800 733MHz CPU, 256MB RAM, 20GB hard drive, ATI Mobility Radeon M 8MB, updated 1280x600 resolution, Windows XP Home or Professional (September 2001) - 
PCG-C1MW - same as C1MV, but with Crusoe 867MHz and 30GB hard drive (August 2002)
PCG-C1MGP - Same as C1MV, but with 30GB hard drive, built-in Bluetooth 1.1, Windows XP Pro
PCG-C1MRX - Same as C1MV, but with 30GB hard drive, built-in Bluetooth 1.1, bundled 802.11b Wi-Fi PC card and XP Home only
PCG-C1MR/BP - Same as C1MRX, but with Crusoe TM5600 667MHz CPU, 128MB memory, 20GB hard drive and forgoes the built-in Bluetooth and bundled Wi-Fi card.
PCG-C1MSX - Same as C1MW, but with Japanese localization.
PCG-C1MHP - Same as C1MW, but with European localization.
PCG-C1MZX - Same as C1MSX, but with Crusoe 933MHz. This was the last and most powerful model of the C1 series, and it was available only in Japan.

References

C1
Computer-related introductions in 1998