Hi
@J_10 and welcome to OF
Your father in law's Constellation could be a reference 2782 or 2852, depending on the type of movement. If you feel a sensation of shifting weight inside the watch and a gentle bumping when rocking the watch back and forth it is most likely a 2782. If not, it is a 2852. The 2782 is from around 1954 and the 2852 a bit later in the fifties.
As a few others have noted, the dial has been repainted at some point which isn't unusual to see. Unfortunately it has a large impact on value and means the watch is worth around gold value + value of parts, which isn't a whole lot. I can't help you with the bracelet, sorry.
EDIT: Looking at the photos again, I am 99% sure that it is a ref. 2852.
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