Then it's older than 1979 . If you scroll down that page it shows pictures . Look for when they started putting wood handles on the lid . Then if yours is one or 2 fasteners to hold the lid on . That will give you an idea .I could find no product information on it.
You can buy whatever you need for that . Replacements are about $20 for the set . I think they're are 4 1/4 " with 4 holes . Just not sure about older kettles .My biggest concern is the lack of bottom control vents.