You need to get more pics. Telechron and many other clock makers had baked lens like a globe. Pam did not(although there are known examples of pams with a baked face),that's why they always flake off after years go buy. Look at the small lettering below the number six,and see what it says if any. Also need to see the back of the face,all white or can you see the colors and shelving thru it. Dirty Telechron faces can be washed,and look like brand new. But don't try that withnavPam.
Looking for gas,oil related clocks,especially neon and spinners .clock repair available. Mick