This ad is from the spring of 1968 for the new Athearn Bay Window Caboose model at the time of its announcement and introduction. Based on a Southern Pacific prototype, the Bay Window Caboose would be the second caboose offering, following 1957's Standard Caboose. The Wide-Vision Caboose was third and arrived in 1974.

The Bay Window Caboose misses Athearn's original ready to run days, but you could find the CB&Q and SP examples fully assembled in Cox train sets beginning in 1971-1975.

Eight roadnames make up the 1968 introduction and a dozen years later that was still what was listed for this model. The only variation I find is the Santa Fe example listed as Tuscan Red in 1968 and later is the typical brighter Caboose Red. The model was sold in kit form for $2.49 at its 1968 introduction. You'll find it reviewed in the July 1968 edition of Model Railroader magazine.