1916 Thomas Elder Lincoln White Feather Token?

In Thomas K. DeLorey's catalog on Thomas Elder tokens and medals (originally published in the June and July 1980 editions of The Numismatist), this token is listed as DeLorey-55. It was issued in April 1916 in a variety of compositions (silver, german silver, copper, brass, aluminum, oreide, fiber and white metal). Diameter is 30.8mm, but the weights of the different versions are not listed. The full description can be found on page 1609 of the July 1980 issue of The Numismatist.

Here's a link to the Newman Numismatic Portal if you want to take a look at those issues of The Numismatist:
https://nnp.wustl.edu/library/publi...isplayAmt=50

My first thought would be a specific gravity test, or take it to a coin dealer or jeweler for an XRF test (not sure what is typically charged for that, though).

Is the token silver colored? It's kind of hard to tell from the reflections on the token in your pics.

"German silver" is a fancy marketing name for nickel-brass, an alloy of copper, nickel and zinc. In-hand it kind-of looks silvery but it does tend towards a yellowish colour, especially when photographed, which makes me think that this is what your coin is made of.

"Oreide" is a fancy name for brass. I don't think your piece is yellow enough to be categorized as this.

"White metal" is a soft tin-lead-zinc alloy, akin to pewter, which was once used to produce cheap tokens and medals; it largely went out of fashion once aluminium became readily available in the early 1900s. White metal looks bright silvery "white" when new but quickly darkens on oxidation to grey-black; I would expect a white metal example of this medal to be greyer than this.