Well, the usual has happened - too much work, not enough play...
I did pick up this cool old scraper holder on eBay. I don't remember seeing one like it before. I'm pretty sure it was shop made, but I could be wrong. Someone put a lot of time into shaping the handle - it is almost entirely curved and feels great in the hand.
For whatever reason, the bottom jaw doesn't quite close tight enough, but that was easy to fix with some shavings:
The only mark I could find is on the end of the handle - "LVM".
Another old tool with its own mysterious past. Whose hands once held it as mine do?