Hi,
My early 250 sl has three original keys.
1 for the ignition only big squarish head key
1 for the doors only small squarish head key
1 glove box and trunk small roundish head key
I don't have an original MB locking fuel cap but I have an after market one, so yes I have 4 keys.
I also have the original MB star key chain.
Joe, that will only work if the locks are original.
My local locksmith had copies of the key blanks.
Bob (Brisbane,Australia)
RHD,1967 early 250 SL, auto