Stainless CAMEL Vacuum Wares Food and Drink Thermos

Hello everyone! I'm new here, but sure glad I found this place. I recently found this Camel Stainless Vacuum Wares Food & Drink Thermos in my attic. I believe it was my great great grandpa's, he was a smoker and coffee drinker. I was wondering if anyone could tell me it's worth. I've seen a one that is like it on Ebay and one on Etsy, but it I'd like to know it's worth before I decide to sell or keep it. Thanks so much for all of your help. I'm sure I'll be asking again soon.