Thanks for that. I believe in the late 1960's the bikes came through a Canadian distributor, maybe Deeley's, or Honda Canada. My 12/69 K0 has an ID plate on it. I can't recall if my 1969 had a plate or not. It was destroyed in a crash not long after I bought it. Purchased in July/69, crashed Aug/69.
The reason I asked is that I have a line on a 3 digit CB750 with non stamped replacement cases and a lot of none sandcast parts on it - a FrankenHonda to be sure. There's no plate on the steering head and I was curious if this disappeared along with most of the correct parts. The frame number is a long way from my sc motor number. I'm trying to figure out what to offer him because of the frame number and a few early parts still on it. Plus it's a long drive just to view it.
Thanks,
Cliff.

Sorry. Canada. Thanks. Cliff.

Since I only have a sandcast motor (260) I feel more like a lurker than a member. Adding a K0 section would be great for me as I also have  a 12/69 K0 I'm nearing the end of a long resto on. Thanks for this discussion! Cliff.

Steve, a little off topic but this pic id from an August 1968 Cycle World. Cliff.

This not mine. On Craigslist Vancouver/Vancouver Island 
http://vancouver.en.craigslist.ca/van/mcy/2779922189.html 
I emailed him for some more details and this is what he emailed back to me:
The frame #CB750  1000737. The eng number space is blank. The early models had chain issues and when the chain broke it would break the case where the eng number went. These were replaced on warranty and the dealer was supposed to stamp the ser. number when it was replaced. Some were overlooked. However there are casting numbers on the front of the eng case indicating that it was made 22nd Apr. '69
Cheers,
Cliff.

I make the seat pan about 25 1/2" + or -, measured with a cover in place. I had the same problem with a Z1 seat cover and after much emailing he refunded my purchase price, not sure about the shipping though, can't remember. I was able to buy a good used cover with some nice patina. The stock seat cover top was 25 1/2 inches. The one I got from Z1 was an inch shorter. Cliff.

Mark,
I can't measure it because the engine is together but this is a picture of the cylinders of engine 260. It does seem to have more of an edge or lip than yours. This probably confusing things more.
Cliff.

I have a 12/69 K0 and have a couple of the 3 way brake line joints as the parts book calls it. The John Wyatt book shows an early K0 to have a red plastic end where the brake light connection is. I have another joint which does not have the slot for the brake line and the plastic is black. Could someone please let me know which is the correct joint to use. The bike I'm working on was a mess and far from original so I'm questioning most of what was on it.
Thanks for any help you can give.
Cliff.