signs (open closed)

closed – come back soon

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this shop was closed but suggests you come back soon (with three exclamation marks).  don’t come back too soon though else it’ll still be closed.  in fact, better to come back tomorrow when it’s open again

closed by appointment only

this shop is closed by appointment only. closed by disappointment only might be more appropriate.
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we’re … OPEN

inadequate use of space. although sometimes the pauses are more important than the words between them.
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