To the best of my knowledge, all 97s came with the 722.605 transmissions.

Easiest way to tell is the "W or S" button next to the shift knob. The previous 722.329 did not come with this feature.

You can do a search, this has been talked to death...some of the early 722.605 needed valve body updates and many have suffered an early death.

From personal experience, I have a 97 E320 with the 722.605 transmission. Car is at 110K has no problems as of yet. Transmission was serviced with original MB fluid at 60K.

Good luck.

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1997 E320