Hello all! I have been getting a ton of old Case knives ready to sell on ebay, but I know nothing about them!

I made my husband go through his collection and get rid of the ones that he didn't want, because the clutter was killing me!!! So, I'm on my own at selling all 75 and it's taking me forever to research all the knives before listing them. This knife has stumped me and I don't know what the handles are made of. Can anyone help? This knife has 2 blades, one on each end, and is a Case XX (1940-64) with NO pattern number. Any info on this knife would be greatly appreciated!!!
I would also like to ask the members of this forume for future help. Over the past few days, I've gotten pretty good at the stag and red bone knives, and can even spot a Green bone handle now, but there's still some knives that I just can't figure out. So if y'all don't mind....I'll be back to this forum to ask your opinion on more knives.
Thank you! Angie
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