Here’s information we found in Sailboat Buyers’ Guide by Alan Chappell © 1983 and an archived vdrestnautic.nl website…
The boat is a Dutch Flyer 28 imported into the US by Holland Yachts which was located in MD. Holland Yachts went out of business in 1988. The boat is called a Piewiet 850 in the Netherlands. All boats from this yard were designed by Mr. Van der Rest.
We have created a new record for this boat. You can find it here: https://sailboatdata.com/sailboat/piewiet-850
Hope this helps.