Comic Title: Batman #321
Publisher: DC (DC Comics Inc.)
Address: 75 Rockefeller Plaza, New York, NY
Cover Date: March 1980
On Sale Date: December 6, 1979 Newsstand Date December 6, 1979
Source: House Ad, Batman #320, Page 29

Newsstand Date December 6, 1979
Source: DC Coming Attractions, #37

Newsstand Date December 6, 1979
Source: Comics Journal, #51

Copyright Date December 6, 1979
Source: Library of Congress, Copyright Office 1979

Newsstand Date December 4, 1979
Source: Comic Reader, #175

Newsstand Date December 3, 1979
Source: Daily Planet, Vol. 79 #46
Listed as on sale the week of December 3rd

Shipping Date November 11, 1979
Source: DC Coming Attractions, #37

Frequency: Monthly
Cover Price: $0.40
Page Count: 32
Editor: Paul Levitz

Title: "Dreadful Birthday, Dear Joker..."
Pages: 18

Feature(s):
Batman (of Earth-1)

Writer: Len Wein
Penciller: Walter Simonson
Inker: Dick Giordano
Letterer: Ben Oda
Colorist: Glynis Wein (Oliver)

Reprinted In:
Best of DC #11 (1981)
Greatest Joker Stories Ever Told HC (1989)
Greatest Joker Stories Ever Told TPB (1989)
Stacked Deck:The Greatest Joker Stories Ever Told HC (1990)
Batman in the Eighties TPB (2004)
Joker:The Greatest Stories Ever Told TPB (2008)
Tales of the Batman:Len Wein HC (2015)
Joker:The Bronze Age Omnibus HC (2019)
Joker:80 Years of the Clown Prince of Crime:The Deluxe Edition HC (2020)

Feature Character(s)

• Batman (last appearance in World's Finest Comics #261; next appearance in DC Special Series #21)

Supporting Character(s)

• Robin (last appearance in Super Friends #29; next appearance in Super Friends #30)
• Commissioner Gordon (last appearance in Detective Comics #488; next appearance in Batman #324)
• Alfred Pennyworth (last appearance in Detective Comics #488; next appearance in Batman #322)
• Lucius Fox (last appearance in Detective Comics #488; next appearance in Batman #323)
• Selina Kyle (last appearance in Detective Comics #488; next appearance in Batman #322)

Villain(s)

• Joker (last appearance in Detective Comics #486; next appearance in Detective Comics #504)