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This copy of a 1913 advertisement page leads to believe that the Johnny-On-The-Spot engines were first introduced on June 1st., 1913.
Port Washington "Johnny-On-The-Spot" (1913-1916).
Guelph "Johnny-On-The-Spot" (1913-1916).
Guelph "Johnny-On-The-Spot" (1917-1930).
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All Gilson "Johnny-On-The-Spot" engines built in Port Washington Wis. were rated at
1-1/2hp. The lowest serial number I found is 127 and the highest is 2898. I thing it is safe to
say that just a little under 3000 Johnny-On-The-Spot were built in Port Washington
from 1913 to 1916.
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Here is another name tag found on Port Washington built Johnny-On-The-Spot engines.
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At the same time in 1913 at the Gilson foundry in Guelph, Ontario, Canada they
were making Johnny-On-The-Spot engines identical in design and color and the
ones built in Port Washington. The engines built in Guelph had a cast brass name tag
and a different block of serial numbers. The first serial number on a 1913
Johnny-On-The-Spot more than likely would have been 51001.
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In about 1917 Gilson introduced a larger JOTS. It was rated at 2-1/4hp.
and was sometimes referred to as the Johnny-On-The-Spot "SENIOR".
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Also in around 1917 the JOTS was rated upwards from 1-1/2hp to 1-3/4hp.
and continued to be built in Guelph until about 1930 when Gilson ceased to built engines.
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Either Gilson ran out of name tags to put on their Johnny-On-The-Spot engines or to save a few pennies,
but for a few years in the 52000 serial number range, no name tags were put on their engines, but instead
they simply stamped the serial number directly on the sheet metal crankguard and also on occassions on the face
of the flywheel.
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Sometimes in the late twenties the Gilson Johnny-On-The-Spot sheet metal
crank guard was replaced with a cast iron crank guard which boasted an
all new brass name plate. This type of tag all have serial numbers in the
54000+ number range.
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It is evident from this name tag that the Johnny-On-The-Spot Senior, which was
first introduced at 2-1/4hp is now rated at 2-1/2hp.
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All JOTS built in Guelph (1-1/2hp., 1-3/4hp., 2-1/4., and 2-1/2hp.,) all shared
the same block of serial numbers. The highest serial number found is 54888 which
indicates a total production of Johnny-On-The-Spot built in Guelph to be just
shy of 4000 engines.
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