A Cassette No. 1 produced limitedly in solid sterling silver never existed; the brand name Graf von Faber-Castell did not yet exist in the stated 1980s. The US offer is just a normal Cassette No. 1 with merely silver-plated lid and sharpener; only the pencil extender could be of silver. The pencils are not limited but only consecutively numbered (serial number like AA 683), and proofs like hallmark or limitation certificate are missing. The claimed contract production for Koh-I-Noor/Montblanc is not plausible, since Montblanc would not have allowed distribution of further products via Koh-I-Noor. The price of 3,500 USD is therefore grossly excessive.