Solder maybe?
Or nickel silver?
Too light for silver (seems that way) one of the remaining pieces is loose..
Solder is tin based these days right?
But it is too rigid to be solder
The edge of a nickel is about the right thickness, but has a slightly more yellow luster
It will leave a faint silver streak on a penny which you can rub off with your thumb.
(Also a grey line on paper)
By contrast, a paper clip will scratch a penny..
I tried a sterling boson's whistle and that also will not leave a streak on a penny,
So it must be a soft metal/alloy...
What about alkame'?
That falls between pewter and sterling silver on a hardness graphic..
Aluminum is one step harder than sterling silver.