Related Clues:

• Historical time to remember
• See 40-Down
• It contains periods
• Big to-do
• Big time
• Significant time period
• Prohibition, e.g.
• Number of birthdays
• Coldwell Banker competitor
• Silent ___ (time before the talkies)
• Mellow, as cheese
• An earlier one may be recalled
• Paleontologist's estimate
• Many moons
• Secret stat, sometimes