Yannis,
Thanks for noticing it, and no need to apologize. You're absolutely correct, many fine Ottoman shamshirs do have metal plates which cover the opening of the scabbard and click/attach to a crossguard. This sword has no signs of such a plate being there. I've seen another similar shamshirs with original scabbard, and also without any signs of that plate. The cover, by the way, is stamped with multiple Sultan tughras. Perhaps these swords are not that good to be covered/secured by any plates (or too good
Thanks again for your comments