What does it mean when Silver is marked simply "100&quo

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My question is actually more general than specific.
I have several souvenir spoons that have number marks instead of a symbol or character hallmark and I understand the three digit codes like 800 900 and 925. I also understand that "40 gr" or "90 gr" indicates the quality of Silverplate. But when the only marking is the three digit mark "100" is that also indicative of silverplate quality or is that a "silver" quality? I cannot find the answer to this elsewhere on the site, but I am not sure how to search for the answer either.
Does this mean 100 gr? or 100% solid silver or what?
I am including a picture of just one of the so-marked spoons. This one is for Heidelberg. I have several from different places and they are not all marked in the same place (on the back of the finial) on the spoon. Some are marked in the bowl, some on the back of the bowl and some on the back of the handle itself. I don't know if the placement of the mark means anything either, like what country or time period they may be from. Any explanations about this to help me understand the use of the number 100 in this way would be most appreciated.

[kerangoumar]

no, 100 does not mean 100% pure silver.

Go to this article by the very knowledgeable Bahner; it contains relevant information

http://www.925-1000.com/forum/viewtopic ... ght=bahner" onclick="window.open(this.href);return false;

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So, if I am interpreting the article correctly, it would appear that the 100 indicates a high density of silverplating because the souvenir style of spoons were most likely made in smaller lots or their small size allowed the silver to settle on the spoons in a greater density?
In any case, it appears to mean that there is more plating on a 100 marked German spoon than on a 90 or 45 gr marked piece.

After reading the article, a couple of additional questions come to mind now. I am interpreting that since there is no additional number after the 100, it was produced before the "new" rating system. There is no reference as to when the use of the additional number began. Any ideas on the dates?

Also, I wonder then if this same "meaning" would follow for the pieces commemorating non-German places, Or if Germany was the only place that used this "rating"-system, so that it would indicate that all of the pieces marked like that were "Made in Germany"
Any comments?