A. Lange & Söhne
Datograph Up/Down
Ref. 405.031 · Serial ALS-DTG-405.031 · 2018
Verified · 3 signers
4
passport entries
3
independent verifiers
Mar 2026
last re-authenticated
3
places in provenance chain
Provenance timeline
- Re-authentication · AllChrono Riyadh
Re-auth.
0x2907...db39
Signature: 0x2907...db39
Transaction: 0xfe20...16ff
AllChrono Authenticator #AC-0147
Re-auth.
- Service · Lange Service Glashütte
Komplettrevision.
0x5009...c822
Signature: 0x5009...c822
Transaction: 0x9dcb...c99d
A. Lange & Söhne Manufaktur
Komplettrevision.
- Authentication · WatchCert Frankfurt
Independent verification.
0x364e...1b51
Signature: 0x364e...1b51
Transaction: 0x9c6c...370b
WatchCert
Independent verification.
- Authentication · AllChrono Riyadh
Authenticated.
0xc05a...8090
Signature: 0xc05a...8090
Transaction: 0x38a5...8040
AllChrono Authenticator #AC-0089
Authenticated.
Specifications
- Reference
- 405.031
- Year
- 2018
- Case
- 41 mm · Platinum
- Complications
- Chronograph, Power Reserve, Flyback
- Movement
- L951.6
Embed passport
Copy this snippet to embed the passport on your site.