Original vintage 1981 Chevrolet "The Big Shift for '81" truck truck advertisement for Chevy's Blazer line of SUVs - “A revolutionary new 4-wheel drive system!  The '81 4WD Chevy Blazer has new automatic locking front hubs and a new, lightweight transfer case.  Now, for the first time ever, you can shift from freewheeling 2WD into 4WD while driving under 25 MPH.  Plus you can shift out of 4WDD without leaving the cab."
 
Dimensions: Approx. 7.75 inches wide by 10.75 inches high.
 
The Chevy K5 Blazer
The Chevrolet K5 Blazer is a full-size sport-utility vehicle (SUV) that was marketed by Chevrolet from the 1969 to 1994 model years.  A variant of the C/K truck line, the K5 Blazer is a shortened version of the half-ton pickup line.  
 
For its first two generations, the model line was a half-cab pickup truck fitted with a removable rear top (effectively making it a three-door station wagon); the final generation was fitted with permanent rear bodywork.  Initially offered solely as a 4x4, the K5 Blazer was also marketed with a rear-wheel drive configuration.
 
For 1969, GM introduced the Chevrolet K5 Blazer and GMC Jimmy utility vehicles. Derived from the 1⁄2-ton K-series, the Blazer/Jimmy was an open-top vehicle competing against the Ford Bronco and International Scout. The Blazer/Jimmy was offered in three configurations; alongside the standard open-top configuration, the model line was offered with either a convertible soft-top or a lift-off hardtop for weather protection.
 
Alongside the longer-wheelbase Chevrolet/GMC Suburban wagon-style SUV (offered with three rows of seating and second-row doors), the K5 Blazer was marketed by GMC from 1970 to 1991 as the GMC Jimmy (reflecting a shorthand nickname for the brand).  Though the K5 prefix was used on Chevrolet badging until 1988, GM never internally referred the Blazer/Jimmy as such.  
 
Following the 1983 release of the S-Series Blazer/Jimmy, to avoid market confusion, GM officially changed the model lines to "Chevrolet Full-Size Blazer" and "GMC K-Jimmy" (after 1986, V-Jimmy), though they are often unofficially still addressed as "K5" to avoid confusion.
 
For 1992, General Motors redesigned its entire full-size SUV lineup, with GMC renaming the Jimmy as the GMC Yukon.  The full-size Blazer was replaced for 1995, as the Chevrolet Tahoe inaugurated a shorter-wheelbase variant of the Suburban.  
 
Currently, GM markets the Tahoe and Yukon alongside the Cadillac Escalade, and later resurrected the "Blazer" name for a midsize crossover SUV while Kia now uses the "K5" name for an unrelated midsize sedan.