Four questions in, you get a working market range. The numbers come from a model of recent comparable sales. Not a guess, not a sales pitch. Use it as a starting point before you list or buy.
1. Who signed it?
2. What was signed?
3. Condition?
4. Authentication?
Want a confidence score on the signature itself?
The app scans the signature and tells you how it stacks up against known authentic exemplars. Use it alongside the value range.
