special issue; collector's edition; timeless edition
Refers to a magazine, book, or publication intended to be kept for long-term reference or collection, often with lasting value or special content.
This special issue of the magazine compiles past famous articles.
As a timeless edition, this guidebook has content that can be used for a long time.
限定版 is a limited edition, emphasizing scarcity, whereas 保存版 focuses on the content's enduring usefulness or collectibility.
permanent preservation edition; collector's edition; version worth keeping forever
Compound of 保存 (preservation) and 版 (edition), literally 'preservation edition'.