Mercer County West Virginia commemorative medals 1776-1976

I’m looking for information on a group of Mercer County, West Virginia Bicentennial medals that appear to be part of a 1976 issue.
From what I can tell:
Manufacturer: L.G. Balfour
Theme: Mercer County WV (Gen. Hugh Mercer design)
Silver medals marked .925 STERLING with set number 296
One gold medal marked LGB 14K, weighs 26.6g
One gold medal marked AU-18 (likely 18K), similar size
All medals are ~32mm and share the same design
The 14K piece appears to be hand-numbered (possibly part of the same set), while the 18K example only carries the purity mark.
I haven’t been able to locate:
Original advertising brochure
Mintage figures
Whether gold versions were part of the official offering or special-order pieces
Questions:
Were these part of a larger county medal series during the Bicentennial?
Did Balfour typically offer gold upgrades separately from numbered silver sets?
Any known mintage estimates or surviving documentation?
Has anyone seen original packaging or brochures for this issue?
Happy to provide additional photos. Any insight appreciated—this doesn’t seem to be well documented online.

 

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Are they the same on both sides? Neat medals but I don't have any info on them.