Gold toned Niagara souvenir necklace from the 1970s. 
A thick glass dome covers the Niagara Falls scene, and the back of the pendant is made to appear as a coin with a lady's side profile. There's also a razor blade charm (1.75") attached to the necklace that is easily removable. 
 
Flat-Lay Dimensions:
Length of Chain - 24"
Niagara Pendant - just under 1"