Narrative:

Cleared to FL280. Center called, noted 28400 ft. PF descended back down to FL280. PF misread an old drum and pointer style altimeter. PNF not paying attention. Pay more attention.

Google
 

Original NASA ASRS Text

Title: ALTDEV OVERSHOOT IN CLB.

Narrative: CLRED TO FL280. CTR CALLED, NOTED 28400 FT. PF DSNDED BACK DOWN TO FL280. PF MISREAD AN OLD DRUM AND POINTER STYLE ALTIMETER. PNF NOT PAYING ATTN. PAY MORE ATTN.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.