McL-Buick badge - Reversed Version Question

[Bill - 29 Buick]

I was given these 2 McL-Buick badges (circa early-mid 30's radiator badge or tail-light emblem) at Hershey this year and was surprised to see what I'd call a reverse image of the normal McLaughlin Buick logo, which I've always seen as white Buick on a blue background, like the one on the left. (Both have the same raised button attachment piece on the back.)

Anyone else seen a Buick one like the one on the right and, if so, when was it used?

Bill McLaughlin

1929 McLaughlin Buick Roadster