You can see in one of the photos that a piece of corrugated cardboard has been inserted behind the card, then green felt applied to the back of the paperweight.
Lot of 11 Vintage Railroad items Missouri Pacific Lines Union Pacific Railroad
MISSOURI PACIFIC LINES - TEXAS PACIFIC LINES 1965 Calendar Railroad
MISSOURI PACIFIC LINES - TEXAS PACIFIC LINES 1977 Calendar Railroad
MISSOURI PACIFIC LINES - TEXAS PACIFIC LINES 1971 Calendar Railroad
MISSOURI PACIFIC LINES - TEXAS PACIFIC LINES 1976 Calendar Railroad
MISSOURI PACIFIC LINES - TEXAS PACIFIC LINES 1979 Calendar Railroad
