JUMBO

Nelson Motor Truck Co (1918-1924)
Saginaw, Michigan

This is a Jumbo truck radiator emblem (1919)    hatm

The Jumbo motor truck was built by the Nelson Motor Truck Company in Saginaw, Michigan. 

The first Jumbo truck in 1918 was a 2-1/2-ton capacity model but, in late 1920, the Jumbo truck line was expanded to six sizes, including 1-1/2-ton, 2-ton, 2-1/2-ton, 3-ton, 3-1/2-ton and 4-ton capacity models all powered by four-cylinder Buda engines. Jumbo truck production ceased in 1924.

Emblems

Jumbo stands for a large elephant and the Jumbo truck logo consisted of the name "JUMBO" with the "M" letter partly formed by the head of an elephant, see the 1918 Jumbo advertisement shown below:

Jumbo truck ad showing logo (1918)  ccj

This advertisement also depicts a 2-1/2-ton Jumbo truck with the Jumbo logo used as a radiator emblem, see detail below:

Jumbo 2-1/2-ton truck showing radiator emblem (1918) 

This Jumbo radiator emblem was cast into the top of the radiator, see surviving 1919 Jumbo truck example shown below and the close up view of the radiator emblem shown above at the top of this post:

Jumbo truck showing radiator emblem (1919)   hatm

Jumbo truck advertisements indicate that some models at least displayed the "Jumbo" name on side nameplates mounted on the driver's cab, see original photo from a Jumbo advertisement shown below:

This is a Jumbo truck showing a body side nameplate (1920)    ebay

The detail of this body side Jumbo truck nameplate is unclear but it may be similar to the Jumbo logo panel shown on most Jumbo truck advertisements around 1920, see example shown below:

Jumbo ad showing possible nameplate (1920) ma

The following is a depiction of a possible Jumbo body side nameplate, but this cannot be confirmed:

Possible Jumbo truck nameplate (c1920-1924)
Size: Unknown

If you have further details of Jumbo truck nameplates, please let me know, in order to update this post.