Historic C++ ABI question

[Florian Weimer]

Given these definitions

struct base
{
   int a;
   int b;
};

struct plus : base
{
   virtual ~plus();
};

is there a historic C++ ABI which puts the vtable at offset 8 in struct 
plus (after the fields from struct base)?  This must have been before 
the Itanium C++ ABI.

Thanks,
Florian