Relley Unis Stereo viewer

For sale: a magnificent collection of stereoscopic photography (3D) from the early 20th century (the 1920s–1930s). A complete lot, ideal for collectors or vintage technical decor.
The lot includes:
Wooden Stereoscopic Viewer: Classic model in noble hardwood with dual lens, in good condition and fully functional.
Handheld Portable Viewer: Compact antique viewer (bakelite/metal) for rapid viewing of plates.
Rellev View Collections: Original envelopes from the prestigious Rellev brand with high-quality photo series, including:
Poblet Monastery (Complete Series).
Montserrat (Complete series).
Special International Exposition of Barcelona 1929: Several boxes and collections of views dedicated to the palaces, fountains, and monuments of the historic Montjuïc Exposition.
Extra plates and cards: Various views in glass and cardboard with embossed period scenes.
Condition: Original items with natural wear from time that gives them character. The lenses are functional and the boxes retain their original period labeling.
A piece of the history of photography and of Barcelona in a single lot.