small 2 blade pocket knife David Yellowhorse ? D Y

I found this small two blade pocket knife at an estate sale in Santa Fe NM. They only identifier is on the blade DY (see close up picture). I contacted a knife collector who stated that some of the early knives were identified this way but the DY does not look like the marking I have seen. The knife is in used but good condition. It measures 5 inches long with the blade open and approximately 3 inches long with the blade closed. I will start this out very low and allow you knife experts to determine its final value. Shipping in the USA is $3.00 PLEASE EMAIL ME IF YOU WANT TO SHARE INFORMATION ON THE MARKING ON THIS KNIFE.