The 1928 ads don' t show a Brunswick. The ad dated December 15, 1929 is the first on-site ad for the Brunswick. I question the date of the source for the above ad.
I'm not sure what you are questioning here. The ad is from The Saturday Evening Post dated December 14, 1929. I guess that you are referring to the date of the watch as 1928 instead of 1929.
Thanks for the correction gents, Brunswick 1929 it is.