Neat find! I’d say ‘64... maybe early ‘65? The serial number will tell the tale. Regardless, to answer your questions:
current value: well, it’s complete. And it’s not very common. But in its condition, it’s completely unusable as a rider or display bike. So at an estate sale I’d say $20. But no more than $50. If you get someone who has American-Picker-itus, and thinks they have found the holy grail in the rough, and bid it up, let them have it.
Worth restoring? Depends on your definition of restored. If I were to restore it, I’d get everything re-chromed because it’s been sitting in a barn for 50 years. That chrome would probably run $500. It would need painted of course, new decals, tires, seat would need recovered, grips... it will get expensive. Easy guess: $1,000. Sell price: $800 at best. So, no profit. I could be wrong on the numbers. Maybe you know someone who can chrome it cheap. Paint it cheap. So maybe then. But, it would have to be done right to get a collector’s attention who will spend the kind of money you will need to turn a profit.
Hope that helps.