yeap, the early tuff 11's were steel hubbed, the hubs were flatter in appearance,
the later alloy hubbed were the more curved and prob look nicer, but more common esp in the uk.
on the values, steels are rarer, so should allways make that little bit more.
i'll let someone else chip with the dates they changed etc
theres a post somewhere on here all about graphites, as they have diff versions also and alot get mis-described