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I can't tell you who made yours, sorry. The reason so many of them are found in multiple sets is that there was a phase where a pair was set at each place setting. As the phase passed, many sets were were sold off or passed on just as a pair. Very often these came with a small matching holder, usually a base with 2 flat "wings" off tho the sides with an indention conforming to the shape of the shakers for them to sit in, and a handle rising up in the middle. I am including pix of 2 sets I have. I don't have the holder for either one. The hand painted set was sold as a blank for a home artist to decorate, it is only marked with the painter's initials on the bottom. The orange luster set is marked JAPAN.
Do they have any markings? They look to me like they may have been manufactured by Pickard China Co., which has a hallmark of gold pieces with etchings as shown. I have a Pickard bowl. Other china companies used gold, too, though. Your guess of the '40's may be correct.