Amano CP5000 two color ribbon  Black and Red
Two color ribbon with a bulge, which is the ink reservoir
    Fits this clock   
The Amano CP5000 can be set to print RED for several time zones, to catch late/tardy punches.
Example:  If they are supposed to get in at 7:30, you could have it punch BLACK until 7:34
Then, all punches from 7:35 until 7:55 (or so, you decide) can be programmed to print in RED. 
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Genuine Amano