What to check in the first 7 days after buying: accuracy, winding, crown feel, fit, cosmetics and return-window priorities.
A one-week check cannot prove long-term reliability or factory water resistance. It is an early defect and setup screen.
What should I check on a new watch first?Timekeeping, crown operation, clasp/fit, cosmetic baseline photos, and any obvious functional faults.
How do I check accuracy in the first week?Compare against a reliable phone clock over several days and note seconds gained or lost.
Should I swim with a new watch immediately?Better not in week one unless you fully trust recent pressure testing and seller guidance.
What if the watch runs oddly in the first days?Document it quickly and contact the seller while return/warranty options are strongest.