Okay so, as of 2016, these were the sales figures for FM’s studio records:
1968 Peter Green's Fleetwood Mac -
1,600,000
1968 Mr. Wonderful - 1,100,000
1969 Then Play On - 2,000,000
1970 Kiln House - 800,000
1971 Future Games - 800,000
1972 Bare Trees - 1,850,000
1973 Penguin - 700,000
1973 Mystery To Me - 1,600,000
1974 Heroes Are Hard To Find - 1,300,000
1975 Fleetwood Mac - 9,400,000
1977 Rumours - 35,500,000
1979 Tusk - 6,600,000
1982 Mirage - 5,500,000
1987 Tango In The Night - 11,300,000
1990 Behind The Mask - 2,750,000
1995 Time - 150,000
2003 Say You Will - 1,600,000
It appears PENGUIN did not outsell MYSTERY or HEROES.
Info found here:
https://chartmasters.org/2016/10/csp...y-analysis/19/