Stewart Warner Speedometers....

The famous Chicago based company established in 1905...from vehicle instruments to Aviation instruments... to home radio and so much more... Harley Davidson bikes equipped with SW speedometers since 1936, those speedometers tells the story and history of H-D bikes too and can be recognized and classified by there different faces but also by small details like the face graduation. trip meter tenth color, pointer color and shape, each speedometer is stamped on its bottom shoulder with a code which tells the type of the speedometer.. 509 is a Speedometer with a trip meter and 529 for Speedometers without trip meter... next 2 letters tell the 0-100 pointer deflection in degrees, for example AM means 205 degrees ( like the 1937 face), the date of manufacturing can be told by the letter / number that end the code , for example E4 means April 1937 . F4 means April 1938....

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