This is info I got from a web site called Uptown Automotive Hobby Shop.
1988 Buick, 1/24 scale, Regal and Reatta coupe by Product Dynamics Ltd., a company in Pennsylvania, which, prior to these Buicks I had not heard of, either in relation to promotional scale model cars, nor anything else for that matter.
Neither the models, nor their colorful packages, mention the name of the company that made them, so they were somewhat of a mystery, or at least a curiosity, when they were released. I don't recall seeing or hearing any advance press on these models before they appeared. I will say that they were welcome surprises in the era of only Camaro and Corvette promotional models being made.
The packages do not label the models as a specific year, and though they are most commonly considered 1988s, they are often listed as 1988 or 1989. The Regal is molded in a maroon metallic, with black A and B pillars, and a red interior, while the Reatta is a solid red, with a tan interior. (The regal pictured here has been repainted).