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My father, Jay Bigler, a hobbyist knifemaker, was pretty much self-taught and didn't begin making knives until he retired in 1993. He passed in 2016, but had suffered from a severe stroke in 2012. He was not able to work on knives from that time on. Before that he was prolific in the knives he produced. No two were ever completely alike. Unfortunately, he did not catalog his knives as to when they were made or the materials that he used.
However, I am beginning to discern a range of years from how he put his name on the knives. The “J Bigler” semicircle puts it in a range from 2004 to early 2012.
I like the simplicity of this nice little pocketknife. My guess is that it is a brushed aluminum with a highly polished (probably) stainless-steel blade... closed, 3.25 inches... open, 5.75 inches... blade, 2.5 inches...
Although it is listed as “used”, pre-owned is a better description for this knife. Selling “as is”.