The Commodore 1901 color monitor is made for the Commodore 128-D as it also supports 80 column wide display.
Information:
https://johan.driessen.se/posts/Adding-an-RGB-SCART-connector-to-a-Commodore-1901-monitor/
http://www.zimmers.net/cbmpics/mlcomp.html
https://oldcrap.org/2021/03/05/commodore-1901-monitor/
https://www.c64-wiki.de/wiki/Commodore_1901