These are the exact same make and model of vintage folding binoculars (or opera glasses) used by The Observer in "Fringe" (though his have high-tech zoom and data-overlay features when looking through the eyepieces).
There are many different types of vintage opera glasses that look very similar, but it is this exact style - with the "2.5x25M/M" text between the eyepieces and the semi-circle "nose-bridge" cut-out (not the squared or straight-lined cut-out) that are used by The Observer.
Seen in "The Arrival" - Episode 4 of "Fringe" Season 1.
