2 Strings Of Vtg C-9 Christmas Lights- Red & Blue- Tested WORKING See Pics/read For Sale

Both strings worked when I plugged them into the wall, but when I tried to plug the blue string into the red string, it didn’t work… So, the end plug on the red string must not be working. Red string had one bulb blown out as well. The blue string has a couple different shades of blue on it. The one bulbs appear darker when lit. All of them were working. Both strings show signs of age and use, but still work. 16 bulbs on the blue string and 15 on the red string.