I remember seeing a few of those back-in-the-day. They were sort of Fisher Co's answer to Whites GEB supreme. Both of which sported the then ground-breaking technology of all-metal VLF (aka GEB).
But they didn't sell that many of that particular machine. Since Fisher soon thereafter started marketing machines which also incorporated TR disc. Hence VLF/TR's of the mid to late 1970s. And most hunter preferred the ability to at least be able to have TR disc, when needed, on occasion.