I'm no Ithaca expert, but there are several here that will be along to comment. Looks to be at least a grade 4 (or higher) and in excellent condition (screws don't look messed with and alot of CC left). Looks to be a very nice gun and in general Ithaca's are undervalued for what they are. More details will be helpful.

Gauge? Barrel length? Chokes? Serial # (range)? Stock measurments etc.

Like I said, someone that knows what they are talking about should be along shortly.