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@wildwest
https://www.ebay.com/itm/Cinelli-Grammo-Stem-Replacement-Cap-New-USA-/132567584934?hash=item1edda4d0a6
A quick Google and it appears a company called leggenda made quite accurate reproduction. But looks out of stock give the price shown.
https://leggenda.co/product/tope-de-potencia-cinelli-grammo/
Might be worth getting in touch with them.