AMERICAN WEIMARANER STANDARD CHANGES RELATIVE TO COAT

Source: Weimaraner Ways by Virginia Alexander and Jackie Isabell

1943 - Original Standard
Color
Silver, deer or mouse grey, usually lighter on the head and ears.  Toe nails should be the above colors or black.
Marks
White stars on breast and the toes are allowable, if not too pronounced and should e bred out if possible.  Slight yellow tinges are a fault, and should be penalized, and any coat with a decided yellow or burnt yellow is not allowed and should be rejected.

1944 - Revision
General Appearance
Color Gray (Silver, Bright, Dark, Yellow); the Dark Gray may be either ash or blue, often blending to a lighter shade on head and ears. A white star on the chest is allowable, but at no other place on the body. Any yellow tinge in such a star is a definite fault.

1949 - Proposed Revision (not accepted)
Color
All shades of gray to taupe often blending to a lighter shade on head and ears.  White markings on the chest and toes is allowable but at no other place on body. Dogs with albino characteristics are to be disqualified.  Any yellow tinge in the white markings is a definite fault.  Yellow or brown spots or markings are a disqualification.

1952 - Proposed Revision (not accepted)
Color
Short, smooth and sleek in shades of mouse-gray to silver-gray, usually blending to a lighter shade on the head and ears.  Small white mark allowable on the chest, but not any other part of the body.  White spots that have resulted from injuries shall not be penalized.
Disqualifying Faults
Coat any other color than mouse-gray to silver-gray. 

1953 and 1959 - Revisions
Color
Short, smooth and sleek in shades of mouse-gray to silver-gray, usually blending to a lighter shade on the head and ears.  Small white mark allowable on the chest, but not any other part of the body.  White spots that have resulted from injuries shall not be penalized.
Very Serious Faults
Any long-haired or coat darker than mouse-gray to silver-gray is considered a most undesirable recessive trait.  White, other than a spot on the chest.

1961 and 1971 - Revisions (current)
Color
Short, smooth and sleek in shades of mouse-gray to silver-gray, usually blending to a lighter shade on the head and ears.  Small white mark allowable on the chest, but not any other part of the body.  White spots that have resulted from injuries shall not be penalized.
Very Serious Faults
Any long-haired or coat darker than mouse-gray to silver-gray is considered a most undesirable recessive trait.  White, other than a spot on the chest.