After looking through the age guide, I'll guesstimate sometime in the early to mid 1960's due to the metal lid handles. If it's the same timeline as the main kettles, that would mean it was made pre-1964, before they upgraded to wood lid handles. Also due to it having the wire triangle at the bottom instead of the solid triangle, that means it was made likely after 1959-60, giving about a 5 year or so window for this model. The plastic wheels are most likely aftermarket to replace the originals. In any case, that is an AWESOME score! Looks to be in great shape too besides the faded exterior!