I have for sale a vintage gold Pen Watch, made in Hong Kong. It's a ballpoint pen with a small battery compartment and a tiny digital watch on the end of the pen.

Pen still writes, but BARELY.  ink is very faint.  I couldn't test the clock because I have no battery for it.  Thankfully, old batteries weren't left in it so it didn't get corroded inside.  Comes with a plastic case and the original instructions.