It's really hard to find exact details about paint and paint information. I'm trying to comprehensively list as much information as I find, but there may be errors. If you have information, please let me know.

  1968 - C10
* Skyline Green Metallic
* Skyline Blue Metallic
* Skyline Gold Metallic
* Skyline Red
* Skyline White
 
  1968 - GC10 - 2000GT
* GT Silver Metallic
* GT White
* GT Red

  1969 - PGC10 - Skyline GT-R
* GT Silver Metallic (#700 Glare Silver Metallic)
* GT White (#501 White)
* GT Red (#184 Glow Red)
 
  1969 - PC10, WPC10, VPC10 - 1800 Series
  Skyline Green Metallic
  Skyline Gold Metallic (#253 Twilight Gold Metallic)
  Skyline White (#913 Thunder White)
  Skyline Yellow
  Skyline Blue Metallic (#577 Fine Blue Metallic)
  Skyline Silver Metallic
  Skyline Red
  Skyline Light Blue - Standard only - (#673 Stratosphere Blue)
  
  1969 - C10 - 1500 Series
  
  

Paint Mixing Chart from Repair Section of Maintenance Manual:

Kansai Paint Primary Colors

#1253 Twilight Gold Metallic

• 38-279-020 Metallic Base II… 68%
• 38-279-014 Ochre… 15%
• 38-279-016 Deep Black… 10%
• 37-279-145 Indian Red… 7%

#1577 Fine Blue Metallic

• 38-279-020 Metallic Base II… 43%
• 37-294-147 Royal Blue Conch?…35%
• 38-279-016 Deep Black… 15%
• 37-279-145 Indian Red… 7%

#1706 Mizzle Grey Metallic