Mercedes-Benz S-Class 1973-1979 Key Codes

The Mercedes-Benz S-Class 1973-1979 uses key code series HD, with 7,890 documented codes spanning the range HD4001-HD7350, HZ1-HZ1200, ND4001-ND7350. Uses a 10-cut double-sided profile. Set the duplicator to flat-bottom cuts 0.1″ wide. Code is typically stamped on the original key bow or available via the VIN through the dealer. The lock is decodable with a Lishi tool. Sign in for the specific match. Bitting data verified as of May 21, 2026.

Code prefix
HD
Code range
HD4001-HD7350, HZ1-HZ1200, ND4001-ND7350
Years
1973-1979
Total codes
7,890
Lishi decodable
Yes (sign in for tool name)
Cuts per key
10
Last verified

Common questions

What key code series does the Mercedes-Benz S-Class 1973-1979 use?
The Mercedes-Benz S-Class 1973-1979 uses key code series HD, with 7,890 documented codes ranging from HD4001-HD7350, HZ1-HZ1200, ND4001-ND7350.
Can the Mercedes-Benz S-Class 1973-1979 lock be decoded?
Yes. A Lishi-style 2-in-1 decoder reads the door or ignition lock without disassembly, revealing the bitting code that can be cross-referenced against this series' key code database. The specific Lishi tool match for this vehicle is available to signed-in locksmiths.
How many cuts does a Mercedes-Benz S-Class 1973-1979 key have?
10 cuts on a double-sided profile. Each cut position has a depth value documented in the bitting code, which determines the key cutting pattern.
When was the Mercedes-Benz S-Class 1973-1979 key data last verified?
Bitting data for the Mercedes-Benz S-Class 1973-1979 was last verified May 21, 2026. Verification timestamps are tracked per series, and updates appear here as locksmiths confirm code accuracy in the field.

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