It's a Kay Value Leader.Can't say if it ever had the Silvertone brand on it.I checked some sites I have bookmarked of Silvertone guitars,but I'm not seeing that Sears sold that specific Kay model branded as a Silvertone.They may have,but I can't find anything to verify it. Here's one just like it. Disregard the asking price.From what I've seen others sell for on eBay,it's ridiculously high.
Here's the actual Kay version with the Kay metal badge logo on the headstock.
Here's one with the Kay painted logo on the headstock.