www.925-1000.com

This is a small (3" dia.) bowl/salt seller? with a 1920 Three Towers mark and Christian F. Heise Assayer's mark. Would love any insight about the other marks. Thanks/tak! https://imgur.com/ZeCu8Ja
https://imgur.com/JKD8WBg

Welcome. Images should be embedded as not everyone will use links. Information is available to help you do this. That said, here are your images re-posted for viewing:

The “D Hammer A” mark is explained in here (scroll down): https://www.925-1000.com/dm_General.html

The initial marks appear both in this list of “G’s”, presumably a maker and perhaps a retailer but that awaits review: https://www.925-1000.com/denmarkG.html