I’m pretty sure I’ve already posted all of these great White Stag ads, but I’m re-posting them just to take a close look at the gloves. In the above add from 1946, the shape and the color are pretty much the same as my pair.
And the same is true of these gloves in a 1945 ad.
This ad from 1944 shows two-tone gloves, but the contrast is much greater, and the palm area, larger.

This ad from 1952 shows two pairs of two-tone gloves. Unfortunately, the gloves are not mentioned in the ad, and there is no sight of the zippers.
This is a page from a White Stag catalog, not dated, but World War II era. There are no zippers mentioned, but that is to be expected during a time when metal was going toward the war effort. My gloves are very similar to the description of No, 80. My guess is that mine are “natural” or “sand” with aspen blue” or “glacier blue” leather. I have more pages from the catalog here.

Wonderful post.
Thanks so much!
I have found an ad from 1951 Lizzie that shows a very similar White Stag mitten with a zip on the back;
http://tinyurl.com/aohrq3w
I do believe you have found them! They don’t have white as a color, but they are the same gloves.
They did in 1950 – “natural” http://tinyurl.com/afy7n4f
The cuff on your gloves are elasticated ? while these appear to have a sort of gauntlet shape. Any wrist boning?
Yes, mine do have boning between the wrist elastic and the elastic at the edge. From the drawing it is hard to tell if the edge is elasticized, but it does look a bit bunched up.