Found these in northern vermont. Any guesses?
They read:
"U.V.M. 1928
EX. SERVICE
B. TESTED"
To the left is a serial number of sorts. I think they are made of tin.
A not-too-wild guess might suggest the University of Vermont.
The tags might be bird or animal leg taps.
You might try the Biology Dept. at UVM and ask.
Don..