Hi, Chris. Nothing to add to what Andrew and JT said. I got your e-mail, but for some reason my server/ISP would not accept & send my response (it bounced it said it doesn't accept e-mail to your account domain).
The one thing that I was going to note is the similarity between these and this older, presentation dha that is inscribed to a general with a date in the Burmese calender that converts to 1798. I see similarity in the shape and general decoration of the scabbard -- silver, chased, with vignette panels and hanger rings -- and in the doughnut0-shaped swellings at the top of the scabbard and where the guard would be if it had one.