A Speedmaster's model reference can narrow down its configuration, but multiple watches share a reference. To search whether one Speedmaster has a theft report, you need the serial for the piece being sold.
Read the card and engraving together
Check which number the seller has provided and what the document calls it. Compare it with the engraving on the watch and any service record. If the serial is difficult to see, ask a watchmaker; don't submit a guessed digit.
Save the result with the Speedmaster's file
Search only after confirming the number belongs to that watch. Keep the dated result, listing, and invoice. If a match appears, pause the sale and contact the provider; if there is no match, continue the other checks.
A clear status result isn't authentication
A stolen-status lookup can't tell whether the chronograph movement, dial, or parts are genuine. It also doesn't establish the seller's ownership. A qualified inspection and a documented sale answer different questions.
If the serial in the parcel differs from the one you searched, treat it as a new watch and contact the seller or platform immediately.
Search the Individual Speedmaster
Keep the model reference separate from the serial used for the theft-status lookup.