So yeah - as you'll have seen in the eBay ad, it's the '77 I was referring to . . . 
 . . . I found reference to it on what I assume is an earlier '77 fiche page (CMS have two listings for the CL77) and it shows up on the swingarm diagram as something called a Registered Number Plate with part number 80501-273-000.  Since it also shows up under that part number on the '72 fiche, and the parts in that assembly are all the same, I assume Honda just duplicated the page.  What you'll have a better handle on than me is whether the image the sticker was taken from is legit.  
My guess is that it may well have been on a very early manufacturing run/low frame number bike immediately prior to cessation of the sticker's printing/application.  Having said that, since Honda used English on most of the stickers applied to bikes sold overseas, the other possibility is that it was a feature of Japan-only bikes, bearing in mind the lack of any other language text . . .
. . . although looking very closely at the example in the eBay ad, the original sticker is for a '72.  The repro has had the 2 changed to a 7, so it could be there never was a sticker for the '77. 
I guess the seller might know . . .
			
			
									
									
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Latest Registry Entry
                        1965 Honda CP77 — Ulsan Metro City, Rep. Korea
                        Restored with original parts — Owner: J. Doe
                    CL72 Swingarm Script Meaning in English
- 
				the-chauffeur
- honda305.com Member
- Posts: 34
- Joined: Thu Jan 01, 2009 9:40 am
- Location: Scarfolk, UK
Swingarm Label
Hi,
Here is the translation of the swingarm label:
Line one: "A low displacement car".
Line two: "The Department of Transport" - "The Model Authorization Number 461".
Line three: "Dream Super Sport CL72 type".
A few years ago I had a few labels for my CL72 reproduced.
Hope this helps.
			
			
									
									
						Here is the translation of the swingarm label:
Line one: "A low displacement car".
Line two: "The Department of Transport" - "The Model Authorization Number 461".
Line three: "Dream Super Sport CL72 type".
A few years ago I had a few labels for my CL72 reproduced.
Hope this helps.
 
                     
                     
                    