Because it isn’t split strictly into centuries it may be called more of a timeline and isn’t strictly what CM used, however I hope you find it useful.
Depending on the period a page represents from 1,000 years to 10 as follows-
Prehistory – 3 spreads
6,000-3,000bc – 1,000 years per spread
2000bc-1600ad – 100 years per spread
1601-1800ad – 50 years per spread
1801-1900ad – 20 years per spread
1901-onwards – 10 years per spread
For more information about keeping a Book of Centuries check out this page by myhomeschool.com.au. I had been procrastinating about getting one made for a long time until Michelle gave me the nudge I needed.