Update - got a helpful guy at Blancpain AD who asked their Heritage dept on my behalf:
Indeed, it's hard to judge from the photos, but it looks like the case and dial are related to a Blancpain production, but not from the same model.
In addition, this movement reference was used in a third model and the engraving on the oscillating weight does not appear to be authentic.
This piece seems to be an assemblage of at least three models.
Please note that these are just observations based on photos.