Also it has a really intricate rear sight with a brass adjustment nob. looks like this:
That is a very nice
Metallverken TYPE II sight insert.
You used to see tem on 96 to 38 conversions. That sight really gives you a good adjustment.
METALLVERKEN SIGHT ADAPTERS
There were 3 different versions. Some folks designate them as Types I, II, and III. These were designed by P.O. Faldt, they were manufactured by Metallverken, in Vasteras, Sweden.
Many sellers mistakenly refer to these as "naval" sights, because the Metallverken company logo was a Viking ship, they assume they have something to do with the Navy. These sights were originally designed for the M38 rifles, cut down by CG from M96's. They will only fit in an M96 sight leaf, not an M38.
The initial Type I was designed for M94 ammo in a M38 barrel length, it is calibrated from 300-600 meters. M94 ammo used a 156 grain round nose bullet.
Type II was designed for the M41 ammo in an M38 barrel, it is graduated from 250-600 meters. These are in 25 meter increments, with a dot signifying 25 meters, and a line signifying 50 meters. On the Type II, 3 is the lowest number, but it has a line and a dot below that, going down to 250 meters. The Type I and Type II were both used by the military.
M41 ammo used a 139 grain jacketed boat-tail spritzer bullet.
Type III Metallverken adapter are believe to be strictly civilian. It is graduated from 100-600 meters, and was regulated for Metallverken target ammo (very similar to military M41 ammo) in an M96 length barrel. Some folks disagree.... I have one of these on my m/96 long rifle.
Your sight is worth between $90 to $100.