Kimtab was a company in Monrovia, Cal. They went bankrupt in 1976. I was able to secure the last set of wheels sold out of the factory. They were originally an anodized gold color. The had a Honda CB750 bolt pattern for rotors. I mentioned to a friend that I wanted a set like my brother has. He mentioned they may have gone out of business so I jumped on the phone to inquire as I really wanted a set. The guy who answered said in fact they had bankrupted and had gone into receivership that day. I begged and pleaded my case for about 5 minutes till he asked what it was I wanted. I needed a full set of wheels and brakes. This included 2 wheels, all brackets, rotors (3), lines, calipers, sprocket,master cylinders. The works. He says I shouldn't be doing this but be at the back door of the warehouse at 9am, bring $415. That was a good bit of money in 76 for a set of wheels. I showed up at 9, knocked on the back door and to opened about 6"s and a hand came out palm up. I put $415 in that palm and then the door slid open just far enough for him to slide the box out the door with his foot and it slammed right after the box cleared. Probably an illegal deal but I just didn't care, I was the proud owner of the last set out the door.
The wheels in your pics are the original gold color they came in. They did make them in aluminum also and , I believe they are more rare (I've never seen one in person), though not as desirable due to the weight difference. The Kimtab magnesium bare wheel weighs in the 8.2lb neighborhood. The Airheart caliper did a fine job by 70's standards but I have upgraded recently to Hawg Halter 4 piston calipers all around, now stoppies are capable that were not before.
Curious what you paid for the bike. These wheels are bring in the $500 neighborhood now for the bare wheel with no bearing carriers or anything.