Sanyo C60 - 2000s - EU
Never seen one of these leaderless cassettes before.
Best guess, these are early / mid 00s.
This is a competent enough cassette, but is really only for collecting purposes, but looks really retro cool and there's not many Sanyo branded cassettes out there.
Sanyo Electric Co., Ltd. (三洋電機株式会社 San'yō Denki Kabushiki-gaisha) (stylized as SANYO) was a Japanese major electronics company and formerly a member of the Fortune Global 500 whose headquarters was located in Moriguchi, Osaka prefecture, Japan. Sanyo had over 230 subsidiaries and affiliates. Sanyo was founded by Toshio Iue.
On December 21, 2009, Panasonic completed a 400 billion yen ($4.5 billion) acquisition of a 50.2% stake in Sanyo, making Sanyo a subsidiary of Panasonic. In April 2011, Sanyo became a wholly owned subsidiary of Panasonic.