The "Primus" Adjustable Vignettes (patent applied for) were photographic or magic lantern slide accessories manufactured by W. Butcher & Sons of London under their Primus brand.

Designed for 1/4 plate sizes, the set allowed users to create cushion, oval, or pear-shaped apertures or masks for slides or prints.

The original price listed on the cover is 9 pence per set of three with all three being included in this box.

In good condition for its age, makes for a very interesting piece of magic lantern ephemera.

Any questions feel free to ask.