A blast from the past, but I wanted to provide some info on the piece...
Based on the images presented, the medal appears to be HK-346; it is listed in the Hibler & Kappen So-Called Dollars catalog.
The piece was struck by the US Mint as an official souvenir medal for the Jamestown Tercentennial Exposition that was held in Norfolk County, Virginia in 1907. The intent of the Exposition (and, by extension, the medal) was to celebrate the 300th anniversary of the first permanent settlement in North America by English-speaking settlers.
The medal was designed by George Morgan with assistance from
Charles Barber. There were four versions of the medal: Silver, Silver-plated, Bronze and Gilt. The medal shown appears to be a bronze example. The medals were struck in a US Mint exhibit on the Exposition grounds.
The obverse of the medal features a portrait of Pocahontas along with commemorative inscriptions. The reverse depicts the sailing ships of the first Jamestown landing party.
This Jamestown Tercentennial medal is just one of the many medals the US Mint struck for various World's Fairs and Expositions.
In terms of value, a medal in the condition as shown would generally not attract much attention. Nicer, undamaged examples in circulated condition can often be purchased for under $30.
Here's an example of the Gilt version of the medal that's in my collection...

Collecting history one coin or medal at a time! (c) commems. All rights reserved.