In theory they are priced the same. Same movement, same spec. The SBDC065 costs more because it’s a special edition and comes with both the bracelet and a (blue) silicone rubber strap.
There is a black dial + blue bezel version of the Marinemaster style which is cheaper:
Normally it comes on rubber, Gnomon offer it pre-swapped onto the bracelet. Gnomon are where I got my SPB053 bracelet from and my SBDC065, I recommend them highly.
In theory they are priced the same. Same movement, same spec. The SBDC065 costs more because it’s a special edition and comes with both the bracelet and a (blue) silicone rubber strap.
There is a black dial + blue bezel version of the Marinemaster style which is cheaper:
http://www.gnomonwatches.com/watches/seiko-watches/prospex-200m-automatic-blue-baby-mm-bracelet-ref-sbdc063
Normally it comes on rubber, Gnomon offer it pre-swapped onto the bracelet. Gnomon are where I got my SPB053 bracelet from and my SBDC065, I recommend them highly.