I'm not seeing a pattern on the reverse, except maybe something going on around HALF. I am seeing a linear toning pattern on the obverse, but that is not the linear feautures that I'm talking about. The obverse linear toning pattern, while pretty, is something you can find on a variety of coins depending on their toning method. Here is my most attractive 1960 linear feature coin. It is end of roll toning that pulls out the underlying linear features.
As mentioned, in 1960 it occurs on all the silver coins, although it is significantly rarer on the quarter and the Roosevelt. Here's my one linear feature Washington, that I bought simply as an example...