Your last picture has the dog’s head mark used in Austria-Hungary from 1867 to 1922 on small 800 standard silver. It includes the letter A for Vienna used from 1872. I don’t know the significance of the two “A” punches.
Phil
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Maker’s mark of Delheid Frères D under a "snake", this particular mark used in Brussels 1862-1980.
In 1828 Michel Delheid (1802-1872) started a silver workshop. In 1862 his sons entered the company. They continued from 1866 under the name Delheid Frères. With mechanical presses, they produced utility silver (tea and coffee services and silverware) in neo-styles. During the popularity of the Art Nouveau style in Belgium, the company went through a successful period; around 1900 the factory employed no fewer than 85 employees. Delheid Frères continued to exist until the early 1980s (J.J. Luijt, Het zilverlexicon voor Nederland en België, Zwolle 2006, page 84-85).For all involved sons and grandsons of Michel Delheid see Dievoet 2003).