The "Xyz" was manufactured in France by Lancart in the mid 1920s. Made of metal, nickel plated and heavy for it's size. It uses 16mm film, paper backed with 12x15mm exposures. The film is advanced by turning an octagonal or squared knob on the right had side. It has a pop up direct line of vision viewfinder. Shutter selection , on the front is for instantaneous (1/25), or time exposures. It has a Roussel f7/22mm

The camera is rare, even in France and information concerning its production even rarer.

Ebay 2006/03/25 1000EUR+commission (no. 134280, Boyer lens), 2006/08/02 836.99USD, 2006/10/29 630GBP

There is an article in "chasseur d'images" n°255 (June 2003) pages 184/185 ...in French.

The article lists three lens found on the camera

Roussel Xyzor f/7,7

Hermagis Major 4,5

Roussel Kynor 3,5

Boyer lens.