Early releases often only featured Hymen as label name and for copyrights.
Catalogue number style:
¥0xx for the 12" series with stamps on the cover
¥4xx for LPs, CD3" etc.
¥6xx for promotional gimmicks (t-shirts, posters ...)
¥7xx for CDs
¥002, Instinctive LP by Ultra Instinct, will never be released.
Promotional gimmicks :
¥601 - Silver Hymen metalpin.
¥602 - 12" record bag.
¥603 - Hymen T-Shirt stamp.
¥604 - Poster. 99.