Il Primo (I sold loads of them) was a low end heavy item made in UK (you could tell by the chrome) for the Holdsworthy Company who were wholesalers and importers and bought several redundant names. Plenty of history on line. The company was The Holdsworthy Company, never Holdsworth, and were importers of Campagnolo, Fiamme, etc.
These stems sold for about £1 when the Cinelli were £1.50.
Remember when Dixons invented a Japanese sounding name for their cheap line electronics.
They made quite decent good value frames in their own little sweat shop, look up the history.
Back in the 1960's my little shop had a higher turnover with them than any other in the south of england.