If my memory serves me right, pre-stock as in pre C= were manufactured by the Los Gatos croud and were turned over to C= after the buy out. C= units rolled of the line with the check mark. Production of these units were a matter of weeks a part. The very first A1000 I remember seeing (1985) at a friends house had the Boing Ball. I baught my first one Xmas 85 and it had the C= checkmark (ugly).
