GMT-Master II has a 24-hour bezel and a second time zone. Batman in a title usually means the blue and black bezel, reference 116710BLNR on the older case or 126710BLNR on the newer one. The nickname is not the spec. The reference is.
Other bezels
Root beer, Pepsi and a solid black bezel are other GMT-Master II watches. They are not interchangeable with Batman on price. Read the reference and the metal: steel, Rolesor, or gold.
GMT-Master in stock

Rolex Gmt-Master Ii 126710blnr Automatic Black Dial Stainless Steel Men's Wristwatch 40mm
$21,495
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Rolex Gmt-Master Ii 126711chnr Automatic Black Dial Stainless Steel 18k Everose Gold Men's Wristwatch 40mm
$20,661
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Rolex Gmt-Master Ii 126715chnr Automatic Black Dial 18k Rose Gold Men's Wristwatch 40mm
$48,116
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Rolex Gmt-Master Ii 126715chnr Automatic Black Dial 18k Rose Gold Men's Wristwatch 40mm
$50,181
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Rolex Gmt-Master Ii 126713grnr Automatic Black Dial 18k Yellow Gold Stainless Steel Men's Wristwatch 40mm
$24,882
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Rolex Gmt-Master Ii 116710blnr Automatic Black Dial Stainless Steel Ceramic Men's Wristwatch 40mm
$17,737
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