What is the value of Carl Zeiss Jena Binoculars DF6×30 859832?

I am trying to hold on to these binoculars until they are worth some money, and so far I think they may be only worth $10.00
They come in a leather case from the U.S. Naval Gun Factory / Optical Annex Shop in Rochester , NY. They are extremely old binoculars.

Nikon Monarch ATB: Reference Value Binos, Part 3

PART 3 of 3: Excellent quality binoculars are indispensable for many activities to include tactical operations, general recreation, watching sporting events, wildlife watching, and hunting. In this three part video series, I take an in-depth look at features, terminology (simplified), and specifications that will make a difference in the performance of your selected binos. My [...]