Buying directly from a Japanese seller is the traditional way to get a JDM-exclusive watch like the SBTR017 or SBTR019, and it's worth understanding what that actually involves before assuming it's the simpler path.
Shipping time
Direct-from-Japan orders commonly take three to four weeks door to door, factoring in processing and international shipping. That's a long window to have money tied up in a package that hasn't shipped yet, let alone arrived.
Import duties and customs
This is the part that catches people off guard. Depending on your country and the declared value, import duties and taxes can add a meaningful percentage on top of the sticker price -- and the package can also get held at customs for inspection, adding more delay on top of the shipping time.

Paperwork and language
Genuine JDM watches ship with real Seiko documentation, but a JDM warranty card and instructions are often partly or entirely in Japanese, and if anything goes wrong, support is typically routed through a seller twelve-plus time zones away.
Returns, if something's wrong
Returning a watch internationally usually means paying return shipping yourself, dealing with customs again in reverse, and waiting weeks for a refund to process -- assuming the seller accepts the return at all.
What changes buying from US stock
The SBTR017 and SBTR019 are the same genuine JDM watches, already imported and held in US inventory. That removes the import duties, the customs uncertainty, and the multi-week wait -- shipping is 2-3 business days, and returns go through a standard US-based 30-day process instead of an international one. The watch doesn't change; the logistics around it do.