A lot of people claim the difference in the quality/clarity of the images between the 150's and 350's is from the wearing down of the plates. I'm not a believer of that theory, if that was true you would see some of the 150's that were printed near the end that look like the 350's and I've never noticed anything like that and with the Plank's I don't think his 150 plate got used enough to come close to wearing it down.
I think it probably has to do with using a different press or printing method or something else.
To me the difference in the 150 and 350 Cicottes is similar to the planks.
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I have quite a few 150/350's that I'll post later