Are there different versions of the Lemania movements ? Plastic & non plastic parts?

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Good afternoon,

I took a photo of my Speedy movement few days ago when I was trying to regulate the movement. Obviously there was a plastic part inside, you can all see it well above the gear wheels.
However,later I was viewing another user`s post with his photos of his watch and particularly the movement through the caseback and there were no plastic bits. I cannot find the photo now ,btw.
Is it me and my vision or there are different versions of 1861?

Thank you in advance.
 
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Yes the plastic part is replaced with metal on the see through caseback versions for aesthetic reasons.