BlackcowboyBS and redeagleorder thank you for your kind comments.
With regard to your question redeagleorder - In his book “Der Hausorden und die Tragbaren Ehrenzeichen des Grossherzogtums Oldenburg 1813 - 1918”, Friedhelm Beyreiss states that 50 pieces were delivered by Knauer. Of these, eighteen were awarded; and of those, two were awarded to men, the remaining sixteen, of course, to women.
I would not be terribly concerned about how your medals are mounted. Inasmuch as this bar would have been assembled from 1934 onwards, we know how by that time the old Imperial guidelines were not strictly followed. Hopefully you will get access to the Schwarzburg Anna-Luisen Verdienstzeichen rolls to solve this mystery. Please keep us posted!
Regards,
Wild Card