Here's a pic of the head badge, it appears to be all metal.
Who would have been in Taiwan back then who they may have been buying bikes from?
I was thinking Giant but all the Giant built bikes I've seen had the serial number on the dropout, this is on the bottom bracket towards the rear.
To me its sort of a mix of parts, but I guess that wasn't too uncommon in those years.
The Cranks are dated 48-9, or 9/1974, the brakes are 10/78, the hubs are 01/79, the Shimano 400 rear derailleur has a CJ date code, and the Shimano 200 has a CI code.

The earliest component is the crankset, the latest the hubs.

Can anyone give a date when Ukai had this style rim? Its as wide as the common Araya W/O but with a raised spoke bed area.