Possible Clues:

• Time-zone units (Abbr.)
• 4 a.m. and 4 p.m., e.g
• Baseball-card abbr.
• ''48 ___'' (Nolte-Murphy film)
• "48 ___"
• MLB statistic
• Baseball-card stats.
• Hours, abbr.
• 6:00, 7:00, 8:00, etc.: Abbr.
• Time meas.