Wonder what speed ranges are obtained with that unusual/reversed pulley arrangement? ***
Appears to be an 'early'(0-8) version.
*** the reversal comment is wrong. The use of a 5" pulley in place of the 4" pulley gives a (0-5) range of 2313 to 8500. I do not know what the extended 5to8 ratios are(assuming the earlier sliding sheave).