In 2007, Sky plc purchased Amstrad plc, taking over their production line in 2011. Ever since, Sky has manufactured different variants of the DRX890 Sky+HD box.
Want to determine if your box is an in-house or regular build? Look at the bottom of your box, and if you see no sign of any Amstrad branding, it is an in-house build. In house builds usually have a Sky sticker on the bottom too.
DRX890-RWith Wi-Fi connector—2013
Version Number: 4f31b0
Version Number: Unknown