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Date registered: Oct 2002
Vehicle: 1967 250 SL, 1963 220Sb
Location: Los Angeles / Altadena
Mentioned: 3 Post(s)
Quoted: 135 Post(s)
A 1971 250 should be a single key system. Sounds like the ignition lock was replaced. Get the datacard for the car and it will give the original key code, which will probably match all of the other locks. Then order that key (from MB or from key-men.com). That should open everything else. The key code also might be on the side of the glove box cylinder (easy to remove) or on the inside of the door locks (also easy to remove).
I have no suggestions regarding re-keying the ignition to match the rest of the car.
Currently: 1967 250 SL, 1963 220Sb, 1965 300SE Lang, 1971 280SE parts car, 1972 Alfa GTV, 1965 Alfa Duetto, 1993 BMW R100R
Past: 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...