I am so sorry it took so long to respond. I have not been on ancestry but I thought they sent emails when someone responded to a post. I have attached it. It says on the box
Nassau an der Lahn um 1830.
When I saved the picture to my file, I noticed something else you might like. I have that it shows Bad Ems where husband of the ancestor from Dieburg is from. I am not sure if Nassau shows up on it. I think I found it by searching images on google for these towns. I just did a quick search trying to find it again and found something that is great for me. It is a German site that tells you the distance between towns. I had to use the translate page feature. I found that Bade Ems and Dieburg are 1 1/2 hours apart. We have often wondered how these two met. Below is the link in case you want to use it.
I saved the picture of Nassau as jpeg. If you want it as bitmap or tif, let me know and I can redo and email to your directly.