Here is a side by side comparison of these two similar glazes found on the A105 produced by Hartford Faience. The one on the right is a more commonly found butterscotch, while the one on the left seems to be much less common and is a mottled dark caramel, or mustard with a very slight brown hue. It is a kind of dark golden yellow. I bought both of these on eBay and thought they were the same color until I unpackaged them.

If you know of a similar glaze on a Hartford Faience piece as the one on the left, feel free to send me an email.