watches, wrist computers, etc. for G1, V3, or M3?

What do we have in the way of watches, compact wrist computers, wrist communications devices, etc. for G1, V3, and/or M3?  Anything ranging from vaguely modern through sci-fi. 

I see some very nice G2 or G3 watches, but not much for the older figures, although I have one or two.  I can certainly kit bash parts to create one when needed, or look into the possibility of trying to get a different figure's accessory to fit nicely around a wrist, but I'm looking to see what relatively simply ready-to-go options are available.