Hi teedewire.
Rather than scroll through post headings I suggest you use the Forum search function. Searching for "Riverhead" should return ever post on the Forum that uses the term whether in the heading or the text of the post.
I have an undated Riverhead folder that hasn't been uploaded to the Catalog Library. Unfortunately, it only shows the Steinberger inspired models.
So, I'm not sure what model you have but I will keep a look out for it