Proshift Derailleur

This red one on eBay has what looks like a very short cage, maybe the camera angle. Also looks like a 1996 model year with the logo style used on the parallelogram? If that is the case, max tooth is 33 IF the cage is 67 mm.
 
This red one on eBay has what looks like a very short cage, maybe the camera angle. Also looks like a 1996 model year with the logo style used on the parallelogram? If that is the case, max tooth is 33 IF the cage is 67 mm.
And how are you able to know this without knowing how many teeth the cassette will have?
 
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