I know very little about them. Our Aussie and Kiwi members will chime in soon.
"The brand emerged when Royston Siddons' Siddons Drop Forgings Pty Ltd turned to tool making to fill post-war shortages after World War II. Original production of Sidchrome tools in Australia was in the Brunswick area in the city of Melbourne, Victoria.
The Sidchrome brand built its reputation with high quality products. Sidchrome up until 1996 were manufactured in Australia, but since being acquired by The Stanley Works (now call Stanley Black & Decker) production is now undertaken in Taiwan." From Wikipedia