Sorry guys, had you going. It is a KB 45 motor from UH. It is a 10 long can, 1800kv IIRC. It is next to an 8xl, a 380 8xl!!!
Here are some pics next to 540 motors. The motor in the foreground is a xl 540, the other is a l 540. I had to, just to see the responses!!
The KB motor seems like a well made motor, connectors already installed too. It is 45 mm wide and 63 mm long. Has m4 threads set 30 mm apart. 6 mm shaft riding on what looks to be 6x12 mm bearings. The shaft has very little endplay/slop, and the can and endbells are nicely finished. I think it may be painted, cause there is a slight texture to the blue. Anyone know if the endbell unscrews? I read at some point that it does, but I am not 100% sure.