For Sale Sinar 553.27 5X7 Format Reducing Adapter Frame Goes From 204mm - 141mm 4X5 Back on 5X7 Camera

Educate me if I've got it wrong please. Proper ID and nomenclature will help me find it's next home. Look at the pics. Tell me what it is. $141. or U tell me what the realistic number should be. Ships for $14 in USA

I'm not sure its for bellows, but rather to mount a 4x5 back on a 5x7 standard. Specifically a "format reducing adapter" code 553.27 on page 13 here: https://www.pacificrimcamera.com/rl/02139/02139.pdf

EDIT: I should add that this is my best guess, not certain knowledge.

Perfect! Thanks so very much for the help. Confirmed by one available in France for $230 US.