Basicbob,
You may be in luck!
In the book, "Strike It Rich With Pocket Change, by Brian Allen & Ken Potter, on page 125, they have listed a 1967
Roosevelt dime struck on a Silver Planchet, The edge of this valuable transitional error should be uniform silver color & weigh 2.5 grams, as opposed to the normal clad coin, who's edge is two distinct colors of silver and reddish brown, & weighs 2.27 grams.
Another quick & easy test to differentiate between Silver & non-silver coinage, that they point out on page 232:
Lay coins on a flat surface, lay a white tissue directly over the coins & then apply a light over the top. A silver or even partial silver coin will appear white in comparison to the grayish-brown color of the normal circulation coin. Test this with Nickel, Dimes or Quarters. You can also test this out with a large Silver coin and a non-silver Dime on top of it. The color difference between the normal coin and a silver coin will be easy to distinguish. You should still conduct a weight & metal observation test to make sure.
The premium value for this 1967 Dime on a Silver Planchet:
Extra Fine: $1800.00
About Uncirculated: $2500.00
Uncirculated: $5500.00+