https://www.genealogy.com/forum/surname ... uardt/486/
If you scroll down, you'll see what one poster said:
Is this the silversmith? The timeframe lines up, as this coin silver spoon would've been made before 1860.I just came across your post. G.W. Marquardt was my great great grandfather. The GW actually stands for George William not Washington as you assumed above. He was born in Germany in 1832 and immigrated to the US when he was 20 in 1852. He settled in Iowa City and owned a jewelry store where he also made some silverware. He later moved on to Des Moines where he was a banker, and philanthropist.
If you still have those spoons I would be interested in purchasing them. In terms of value, they're worth their weight in silver. He wasn't famous or anything for his silver.
Anyway, here're the images. My apologies that these are not the sharpest, as I still have yet to receive them. Thank you in advance.