I have a Chinese "stock or souvenir book" from the 1980s. I believe I read that these books might not be the best in terms of keeping stamps in good condition. As these are mint stamps, should I move to VARIO pages?
This looks to be one of the better made ones. If you live where humidity doesn't get too high and you can store the stockbook and its stamps in a relatively cool and dry place, it should be no problem. Humidity, heat and time may warp the pages and the pockets (blank row on last page?) and if/when that starts to get irritating, it's time to move the stamps.
Personally, I'd never use a stockbook or similar which comes from an unknown manufacturer. I would always discard it and use one from a recognised philatelic brand. It's just not worth the risk - by the time you find out the book is unsuitable, it could be too late.
I do not like the looks of the page edges, it appears to me to be some slight toning (acidification). This may only be caused by previously poor environmental conditions, but I would move them just in case. You could check to see if the stock book is archival with this pen https://www.amazon.com/Lineco-Testi...68894&sr=8-5 But note that the pen leaves a permanent mark, so check in a inconspicuous place. Don