Model number 830 is listed in Sam's 81-19, so the set is likely from 1949 or 1950. I tried to pull that folder, but only found it to be missing.
Any set from that far back is worth hanging on to if it looks to be in good condition. But being from that far back, it is likely to have a bunch of dried out electrolytics and paper/wax capacitors. It might not be wise to fire it up so quick.