The sibling to
link SBGZ005 is housed in a marginally larger case SBGW260 is 38mm in diameter I would say that I defy anyone to tell the difference with the two watches in hand but I bet there are enthusiasts out there who could do it. While SBGZ005 uses a top-of-the-line hand-wound Spring Drive
link movement SBGW260 uses the mechanical hand-wound caliber
link 9S64.