Seadweller double red - 1974

[Plume]

Any thoughts about changing the crystal on a double red - mine is original 1974 and in good condition with a few small minor scratches. In reading other posts it seems the consensus is to leave the original and try polish out scratches. What about the bracelet? Again, mine is original and seems to be fine but don't want to find excess wear and the watch falls off my wrist.