This looks like an old-timer. There's no manufacturer's name on it. It's beautifully made and in excellent condition. It can go in my spare screwdrivers drawer.- - -
Following is a list of all the Robertson handle colours, size numbers and corresponding screw sizes.
Orange, No. 00; 1 & 2 screws.
Yellow, No. 0; 3 & 4 screws.
Green, No. 1; 5, 6 & 7 screws.
Red, No. 2; 8, 9 & 10 screws.
Black, No. 3; 12 & 14 screws.
There's one more larger size that also has a black handle. I've never encountered it, but apparently it does exist; it's the No. 4 size for 16 and larger screws.
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