Did the CB750 1971 K1 ever come in candy blue green anywhere in the world? There are those that say it did but I can't find anything that substantiates that.
Looks like the candy blue green K1 was sold in the Japanese market. I referenced the Japanese model parts book (see pic) and came up with these part numbers listed below. Also note the letters AZ at the end of the part number indicate the color, which is candy blue green.
1969-70 Fuel tank and large side covers with slots:
83700-300-020AZ right side cover
83600-300-020AZ left side cover
17500-300-040AZ fuel tank
1971 Fuel tank and side covers without slots: (starting serial # CB750-1055209)
83700-300-030AZ right side cover
83600-300-030AZ left side cover
17500-300-040AZ fuel tank
Example of a Japanese market candy blue green K1 recently sold by Yamiya: