It's really hard to find exact details about paint and paint information. Showa era paint manufacturers did not create ways to accurately preserve information on colours - particularly during changes in paint technology. One example is mixing values for lacquer paint colours that can't carry over to urethane paint. I'm trying to comprehensively list as much information as I find (much of which may be inaccurate), 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
#1577 Fine Blue Metallic
#1706 Mizzle Grey Metallic
#0224 Gozama Beige
#0673 Stratosphere Blue
Same manual, different paint:
# 709 Reef Metallic
#0154 Glow Red
#0912 Thunder White