Not sure if you're allowed to post items that dealers are selling???? if not then please delete this.
I came across an interesting Dha this dealer has for sale.
http://www.joesalter.com/
Item #2014
The scabbard has a lengthy 1941 dated presentation inscription from a deputy commissioner to the Headman of Insein Township for his assistance in revenue collection and assistance to police.
The dealers site has a lot of photos of it. Thought if the inscription is contemporary to the Dha this may aid in identifying similar unmarked Dha's.
Best regards,
Jeff