This is a set of four antique cast iron side or "banjo" style sash locks made by the Champion Safety Lock Co. with a patent date of August 25, 1885. 

Points of Merit of the Champion Side Sash Lock: 

Patented Aug. 7, 1883, Aug. 2S, 1885, and Jan 26, 1886.
The Champion Side Sash Locks do away with the incessant rattling of the windows, as the sash, when locked, is as firm as in a vice.
They will lock the sash, upper or lower securely at any desired point, affording an excellent and safe means of ventilation.
By simple pressure against the sash, when locking, it acts as a weather¬ strip, and keeps out the dust and cold air.
They are neat in appearance, easily put on, cannot get out of order, and do not damage the finish of the window.
They are CHEAP, SIMPLE, DURABLE, made of malleable iron or bronze metal, have no springs to break or rubber to soften or wear out.
They are just the thing for window screens or sashes without weights.
These locks have been in extensive use for a number of years and have rapidly gained the public favor from the Atlantic to the Pacific Coast. Try them and you will buy them.
BEWARE OF WORTHLESS IMITATIONS.