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April 12, 2015 at 7:35 pm
#13804
It is a 1950 Firestone 5 hp. To decipher the 5017: 50 means made in 1950, 1 means it has a Firestone badge and 7 means its a 5 hp.
Why it ended up 7 is as follows. The first 3.5 hp models were designated 1 0r 2 depending on trim level. The next motor put in production was the 7.5 hp and it was designated model 3. Then in 1950 or so they introduced the 5 and 10 hp models. The 5 hp has designation 7 and the 10 hp has designation 8.
It is confusing!