Thanks for your comments guys...very helpful.
Just for info on this type of Rinji Seishiki scabbard, it is definitely made this way. No sign of ever having had a a haikan or an ishidzuki. It is "painted" with some light brown/yellow (I presume) waterproof lacquer. All original.
It may have had a canvas cover like the ones shown in a couple of the pics here, if so thee cover must have had a reinforced leather top section with its own haikan strap and ring and of course, it would have had a reinforced leather section on the bottom.
Of course, it may have been leather cover also, with its own built in leather suspension ring.
I can assure you there is definitely no rub mark to show that it ever had a metal band/ring type haikan on the scabbard.
I will just keep my eye open for a cover...one might turn up.
Thanks to all.