I'm pretty sure there's a pic of that exact same tool.
I'm pretty sure you need to take a closer look at the OP's photo. That ratchet arm doesn't compress, it EXPANDS the jaws. Also, a spring compressor would have a small lip to keep the spring from sliding out of the jaws.
I'm not saying you're wrong, but then again, neither am I....
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https://www.ebay.com/itm/Antique-Mo...g-Compressor-Banner-M-A-Co-LQQK-/162978508643
Hand milker for cows before they got electric milkers............LOL Some kind of spreader from the way it looks.
Sounds kinda *****It's a speculum from the old world.