Could someone help identify

[Long Gun Preacher]

I just picked up a beautiful Browning (Miroku) 1885 low wall in 45 Colt. Appears to be made in 1998. It has a 24 inch bbl.  Case hardened receiver.  It has a non adjustable full buckhorn and was drilled and tapped for a tang sight only.  I cannot find this version in any Browning catalogue 

[PaleWolf Brunelle, #2495L]

That might be a replacement rear sight.

Like THIS ONE (similar to a Ruger 10/22 rear sight).

It is adjustable and is considered a "flat top"...not a "full buckhorn".