"WF10S" = weight forward, #10, sinking. Not sure how you arrive at this being a 6wt now.

If it's "new" enough to use this modern line designation (as opposed to "G2AF"), and it's not visibly deteriorated, then it should fish. I wouldn't expect it to perform like the top shelf lines you can get today, but it won't explode. Or if you think it is old enough to have vintage appeal on a resale, then that's another option.