If you're willing to use translation tools and an internet seller with a global presence like amazon.co.jp, I believe you can find them easily, if not from the publisher directly.
World Photo Press website is www.monomaga.net
Translated, the category is Clock. It's below World Watches, which appears to be a periodical. Each has a WPP number & code that can be used to match with the vendor of your choice.
Information for the Speedmaster book (2008 Japanese version of A Time Capsule as far as I can tell.)
Translated title: 20th century storage Omega Speedmaster World Magazine No.600
Code: 819806
ISBN :978-4-8465-2600-9
www.monomaga.net
Information for the Omega Seamaster book
This one doesn't have an ISBN number listed for some reason, but those sites that suggest related purchases had it pop up when I located the 2008 Speedmaster book.
Translated title (sorry): Sima omega-Star story WARUDOMUKKU 447
Code: 819651
No ISBN listed
www.monomaga.net
Hope this helps.
P.S. I'm new here, and even URL fragments are being turned into renamed links - they work in preview, but I can't fiddle with it to stop it. An alternate entry point comes up as a link in Google if you search for "monomagazine".