Thanks Conway and Bruce. I’ve dug out my copy of Dawsons to refresh my memory on these police sabers.
@Ghaad47, according to Dawsons on pages 300-313, your sword with that half-decorated backstrap is a sword for police lieutenants. The police logo on yours looks like what Dawson describes as a 16 ray badge, found on lieutenant and superintendent swords.
Whereas a sword with a fully decorated backstrap (similar to the army field grade counterparts), are for police superintendents. These are shown on dawsons page 314-315.
*Dawson, Jim. Swords of Imperial Japan, 1868–1945. Cyclopedia ed. Newnan, Ga.: Stenger-Scott Publishing, 2007.
All the best,
-Sam