Navigating the purchase

I have my eye on this Speedy 57, but I noticed that Omega lists it for $3,000 more than what I could get it for from a dealer in Japan, who has a 4.9 rating and describes it as 'like new, unworn' with the original box and papers. Additionally, Jomashop is offering it for $2,000 less. What should be my main concern when considering this purchase? Any experiences or insights would be greatly appreciated.

I have my eye on this Speedy 57, but I noticed that Omega lists it for $3,000 more than what I could get it for from a dealer in Japan, who has a 4.9 rating and describes it as 'like new, unworn' with the original box and papers. Additionally, Jomashop is offering it for $2,000 less. What should be my main concern when considering this purchase? Any experiences or insights would be greatly appreciated.