Hitachi SR - 1981 - US
1964 - Maxell Electric lndustrial Co., Ltd. changed its name to Hitachi Maxell, Ltd
In essence Hitachi Cassette Tapes are Maxell rebranded cassette tapes.
In this case SR-C90, a tape manufactured circa 1981 is in all likeliness a Maxell UD-XL-I tape.
These are very rare tapes and I don't have many to offer.