iStamp,
It looks like your Estero stamp has a postmark starting with "23..", making it most probably "234" (Alexandria) or "235" (Tunis). These two postmarks are common on Estero stamps - so it can make sense.
Peter is right, I started a thread on these issues last year - and our friend from Down under has already posted a link earlier in this thread
Quote:
I'm not sure but wasn't this estero 5c intended for turkey
Can't help, but would be interesting to know

Keep posting!