The 9th Inf Div. was activated July 18 1018 and deactivated Feburary 15 1919.
The 9th Inf Div didn't exist in 1926. Therefore there could be no model 1926 9th Inf Div belt buckle.
It wasn't reactivated till August 1940. It served in North Africa and Europe during WWII
The only oriental service was in Vietnam from 67 to 72.
I am not aware of ANY Official 20th century unit numbered belt buckle. None were ever approved by the Department of Defense.
If someone is trying to sell you a model 26 9th Inf Div buckle they are scaming you.
Save your money friend.