Well, according to the catalog from 1905, it's worth $4.75 so it looks like you overpaid. Okay seriously, so I had a few minutes and did some searching and found out the company started making planes after 1900 but shut down in 1919 so it's somewhere between there. I also found the catalog which is where the price came from; here is the link for that. http://www.toolemera.com/catpdf/union1905cat.pdf I really couldn't tell you anything about the value, but as for the quality, it looks like it's working well for you so I would say it's good enough.