Be a 1954. At that era I think the model was just Power King. The later Power Kings had the HP/tire size as the model.
I would start with powerkingtractor.com
There are also some groups on Yahoo. Try searching Power King or Economy on Ebay also. The clutches where pretty much the same through the later Power King Tractors. I have a 1957 and it had the same clutch as my 1978s.
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