I wish I knew enough about these old Craftsman saws to know which ones are worth a hoot... I see old Craftsman cast iron contractor saws on Craigslist all the time here for $100.00 or less still running, and in generally good shape, just typically surface rust on the table...
Craftsman saws with the prefix 113 were made by Emerson until ~ 1997....the same company that now owns Ridgid, and the same company that built the Ridgid saws from ~ 1997 until ~ 2004, at which time they contracted with Ryobi's parent company to build them...the name is still owned by Ridgid. Ryobi built the Craftsman saws from ~ 1997 until ~ 2004. These saws are not all the same but were similar and have many parts that are interchangeable.
Many of the Emerson made full size Craftsman contractor saws had a number like 113.298***, and were very similar from model to model, often only varying by the options like the wing material, fence type, type of leg stand, and other options. AFAIK
, as long as they start with 113, are full size (27"d x 40"w w/wings), cast iron, and have at least a 1hp (13-14amp) belt drive induction motor, many of the parts will be interchangeable, and the saw should be worth ~ $100 and some refurb time. The Ryobi made saws started with 315.******, prior to Emerson it was King Seeley (103.******). I'm sure the King Seeley saws were well made but I'm not sure how standard the parts were. The Ryobi made saws should be more standard, and while not as well respected as the Emerson made saws, can still be transformed into a decent running saw. The vast majority of standard full size saws can be equipped with new motors if needed, new belt, new fence, new wings, new miter gauge, new leg stand, etc. Many parts are still available, and used parts from another old saw are an option if need be.
If you're looking to resurrect one, make sure it's belt drive and not the Sears "Flex" drive, and make sure they're cast iron and not aluminum, but even those saws have some value depending on what's on them. Even if you're not looking to fix one up, they can be worth that much in parts on Ebay, including the flex drive saws...motor, motor bracket, blade guard, blade bracket, switch, wings, miter gauge, throat inserts, handwheels, leg stand, and fence are all worth something...the better the condition the more they're worth. Sometimes the guts or body are worth something too but are usually cost prohibitive to ship. I've bought and sold 5 or 6 of them. All but one were sold for parts. My 13 year old son and I bought two for a total of $110 this spring and tore them apart and sold the parts on Ebay and pocketed about $175 to fund other tools or projects. There's not a better way to get familiar with these old saws than to tear one apart!