Breed Facts
How the division of sizes evolved in the UK -  information provided by Canine Breed Press Contributor and Breed Specialist Mr Jeff Crawford (Voryn)
1935 -  The Miniature Club was formed - original weights suggested for dogs to be exhibited was 12lb - reducing to 11lb the following year.
1948  -  Separate Registers were granted by The Kennel Club for Longs & Smooths with suggested ideal weight of 7-9lb,with a limit of 11lb.
1949 -  The first set of Challenge Certificates (CC), were granted for Miniature Longs & Miniature Smooths in.
1959 -  The Wires separate, with a 12lb limit till
1967 -  The Wires were brought into line with the other Dachshund varieties.
1977 -  The Crossing of the coats ended.
1992 -  Recessives could no longer be registered
1986 -  The ideal weight of Miniature Dachshunds became 10lb, but no prizes should be awarded to a Miniature over 11lb.
Apparently in the 1950's some exhibitors can still remember classes for Standard Smooths under 18lb, & some top quality stock being shown!
Despite our ideal Standard size is 20-26lb - the weight is going up and up! - 34lb or more.
As a note of interest - 
In Germany - Recessives could not be registered as long ago as 1924!
In Germany - The Long Hairs are still retrieving from water, and are very good at it! - more of a gundog type