Nevada Jacks chips were made by both ASM and later on
BCC. The 312 edgespot chips were all made by ASM, and some of the solid chips may be from ASM as well. Most of the solids and all of the non-312 edgespot chips were made by
BCC. If you look at the pictures in this listing closely you can see the not-quite-circular inlays that some
BCC chips were (in)famous for. Although Borland used the Nevada mold extensively, the Nevada Jacks chips are all from after Borland passed away and Jim Blanchard (of ASM) bought the mold. Jim Blanchard produced the ASM chips, and later on sold the mold to Nevada Jacks and the chips were eventually made by
BCC on the Nevada mold.
Please feel free to fact check me as I may have some details wrong. David Spragg has a great article on the history of the Nevada and Diecard molds here, which is where I got most of my info from:
http://www.marlowcasinochips.com/links/davidspragg/borland/bjmolds.htm
On a related note, I look forward to receiving some of these chips, and I'm on the lookout for more
BCC Nevada Jacks chips!