from the 1980s. It's listed in The Chip Rack as N8128 with an 'F' value ($20-24), but they're pretty often available on eBay for less (I got mine in a lot of a few other colors for about $5 each). There are 12 different colors from the same issue.

I hope this helps .

Brent J. Jensen
R-8007
orbis non sufficit