I'll check the details on my 1982, especially the BB work, brake bridge, seat cluster.
It may be the paint, but the work on that seat cluster looks nice and precise.
There were a couple of builders who apprenticed under Rossin.
That's all I know, but I'll check.

Not very much like my 1989, but there are a lot of Rossins.

Thanks to jonny7 for the FB group heads up.