Märklin is responsible for the creation of several popular model railway gauges or scale, noteworthy exceptions being N scale and Wide gauge. In 1891, Märklin defined gauges 1-5 as standards for toy trains and presented them at the Leipzig Toy Fair. They soon became international standards. Märklin followed with 0 gauge (by some accounts as early as 1895 or as late as 1901), H0 scale in 1935, and the diminutive Z scale, 1:220, in 1972  — smallest in the world for decades  — under the name Mini-Club (the scale of Z was assigned after the product line was introduced). Mini-Club was developed as Märklin's answer to Arnold Rapido's introduction of N gauge.