|Pendant of Bierdümpfel Arms
More details on the crest can be found at http://jordanclan.org/family_tree/Research/bierdumpfel_crest.html
Names written on the backs of pictures confirm info I discovered online, which means I made good guesses! Whether the Johann von Bierdümpfel who earned these arms has any relation to my Bierdümpfel family is another question, however. My great-grandmother had these pendants made for her two children, my grandfather and great aunt, so they are not long-time family heirlooms.
And now that I have my great-grandfather's naturalization certificate, I can request the rest of his papers using the naturalization date and the name they were filed under: Heinrich William Otto Jurgens. The requests for William Jurgens have not yielded results - now I think I know why. :)