Z scale
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The Z scale format was created by Märklin and launched at the 1972 Nuremburg toy fair with the Marklin-specific branding of mini-club.
The format uses a track gauge of 6.5 mm, and has a quoted scale of 1:220. The format was assumed to be the smallest scale that would ever be commercially possible, hence the use of the letter "Z" (but the subsequent "niche" T scale format is even smaller, with 3mm track!)