For some reason I just can't figure out this sash buckle...

[calis_stuff]

I've had sash buckles before, usually with a pin mechanism but this one has me stumped.

Is there another part missing that would have clipped onto the rotating buckle part ?

This is large at 4+1/4" x 2+1/4" and because of the curvature of the design and prong placement I'm guessing M'lady would have worn this vertically instead of horizontally ?

I just can't figure out how the sash would have been used with this buckle.

[1940fc]

Hmmm interesting & pretty.   I`ve never seen one like that.

I just googled  Unique Vintage Sash Buckles (by image) & see several examples..even listed on here but none  show or explain how it is worn. 

There are some on Morning Glory site also. Wonder if there is a site  anywhere that shows  how some of this stuff is worn?

[mforjan]

Here is the page Sarah mentioned with a few that look just like the construction on yours, so it must be complete:

http://www.morninggloryantiques.com/collectSash.html

[calis_stuff]

Thanks Guys ! I should have mentioned I Googled this buckle last night and saw the same pages you found. I tried looking for a site that shows you how ithis type was worn but I can't find anything. 

[calis_stuff]

Pretty simple once it was explained to me on the Costume Jewelry FB page. For some reason I wasn't thinking of the sash having ready-made holes.

Can you tell I've had a bad week ? 

[1940fc]

And now we know........

the rest of the story! 

[mforjan]

Thank you, I've always wondered