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If you're truly using the bourne shell and not some variant of the bourne again shell (bash) then I don't believe that using brackets like that is available to you.
man 1 sh
If you read the man page it will tell you what is supported. After reading a bourne shell man page I found on the internet (because I don't have bourne shell in my system) the file name expansion doesn't support curly braces.
What Linux distribution are you using?
The (real) Bourne shell is very unlikely to be installed on your machine. It is generally emulated by clones like dash, bash and others.
bash supports the brace based syntax you are using but not dash which is likely what you use.