Special Purpose Truck
April 1988, wide dies
Collection of the author

This type is the wild card of Vermont plates and can appear on just about anything. I've seen them used on bulldozers, backhoes, front end loaders, steamrollers, cranes, farm equipment and cement trucks. These plates began at 100S.
May 2006, wide dies, new style sticker
Photographed in use
November 1989, wide dies
Collection of the author
December 2001, narrow dies
Collection of the author

This is a remake, especially if you compare it to the next plate...
December 1986, wide dies
Picture from eBay

One off from the plate above.
Undated narrow dies sample
Private ALPCA collection

Note the die variation - the second to last digit is a letter O.
April 2006, narrow dies, new style sticker
Photographed in use

These plates started at S10000 on the narrow dies. I guess this plate is the 14th one issued!
May 1999, narrow dies
Private ALPCA collection

At some point, a space appeared between the S and the digits.
June 1998, narrow dies
Collection of the author
February 2006, narrow dies, new style sticker
Photographed in use

The space has disappeared, but not for long...
April 2006, narrow dies, new style sticker
Collection of the author
November 2004, narrow dies, new style sticker
Photographed in use

Now I have no idea what blocks of plates have spaces and what do not. I believe the ones currently being issued do have the space, possibly for better legibility.