I have 2 yellow 4x JK Aviars 174g and a white 3x JK Aviar 174g.
4x's are probably 6.5-7/10 and the 3x is probably 5.5-6/10. I'll have to look at them when I get home, to get a better assessment, been a while since I touched them. None are abused. The 2 4x were my putters for a while, so only used for putting, not throwing. 4x's have name and number on them, i don't think the 3x does, can't remember. But if interested, I can shoot some pics for you when I get home.