Trying to identify logo on back of chair

Hi all - trying to find out the origin of this chair and its logo on the back. The logo is CAS - but I suppose it could be read as CAS, SAC, SCA, ASC or ACS. any advice would be greatly appreciated. The chair has come from Melbourne Victoria Australia and is probably a good 30 odd years old.
I have since been told they are probably 100 years old. The arms and seat have been reupholstered but the back is in original condition. There are no other markings on the chairs at all.