A good tomato tag can provide you with lots of helpful information. The picture on the tag isn't always accurate. If you aren't sure, check a catalog or ask where you purchase the plants. Average number of days from transplant to harvest.
All tomatoes are either determinate or indeterminate.
Seeds saved from a Hybrid tomato will produce a tomato, but not the same variety. Seeds from an open pollinated variety will produce the same tomato if no other variety was grown nearby. Each letter represents resistance to a common tomato problem. The more letters the better, but keep in mind they only denote resistance. General description of the type of tomatoes you can expect from this variety.