Easily accessible keychain gadgets seem to be all the rage, so I suspect the ISI Pocket Watch would be a real hit if it is eventually made. It unites a keychain with an unpretentious digital timepiece.
The digital display is housed in a semitransparent cube measuring 20mm square and the time is only visible when the cord is gently pulled. A separate turned aluminum holder houses two button cell batteries to power the clock. For additional images,