I think this is the Jam in the UK. Or at the very least their chart numbers only ever get better (ignoring the 20 > 22 at the start because Modern World has gone silver whereas In the City apparently hasn't).
A pair of fives: The Divine Comedy in the 90s, excluding mini-album A Short Album About Love, and 80s Bunnymen in the US.
On a much smaller scale I think this has to be true of Show of Hands for all their proper (non-instrumental/covers albums) for, I don't know, about two decades. Their last album got to 48, the one before it 70, before that 73, before that 170, before that non-charter with their most mainstream press attention yet (and their best-selling single too), before that another non-charter with what was then their most mainstream press attention yet, before that another non-charter with what...
― you can see me from westbury white horse, Thursday, 21 September 2023 03:05 (seven months ago) link
Another full discography: Japan
― you can see me from westbury white horse, Thursday, 21 September 2023 13:41 (seven months ago) link
is this actually true for Genesis? can't find the actual sales figures but I thought SEBTP sold more than The Lamb?
― frogbs, Monday, 2 October 2023 20:01 (seven months ago) link