Specific model and parts, Grandfather's watch.

mac_omega

Lumed dials of this age often have lost most of the luminous material and the numerals look like metallic foil. The rough structure on several numerals made me think of this possibility. The photo is not sharp enough to make a final decision. You have to look at it with a 10x loupe or/and expose it to UV light and see if there is some luminous left. Even with radium lume there might still be a very faint glow visible.

I want to demonstrate the loss of luminous material on 2 examples of ref 2410

You can see the starting of lume loss on the left example and in the right example nearly all of the luminous is gone except tiny rests at number 6 and 8. Without these minor residuals you might think the dial was designed with metal foil numerals only. Sometimes the rest of luminous can be hardly seen. When assessing dials I rely on my experience and go from the dial design - OP´s dial might have started as a luminous one...

Here you have a comparison with one of my ref 2337 examples on the left:

Although it is a centre second dial you can see the similarity in the layout: with zone and the same shape of the radially orientated numerals (here with fully intact lume though).
Disclaimer: All photos for comparison from my chronometre book.

mac_omega

Lumed dials of this age often have lost most of the luminous material and the numerals look like metallic foil. The rough structure on several numerals made me think of this possibility. The photo is not sharp enough to make a final decision. You have to look at it with a 10x loupe or/and expose it to UV light and see if there is some luminous left. Even with radium lume there might still be a very faint glow visible.

I want to demonstrate the loss of luminous material on 2 examples of ref 2410

You can see the starting of lume loss on the left example and in the right example nearly all of the luminous is gone except tiny rests at number 6 and 8. Without these minor residuals you might think the dial was designed with metal foil numerals only. Sometimes the rest of luminous can be hardly seen. When assessing dials I rely on my experience and go from the dial design - OP´s dial might have started as a luminous one...

Here you have a comparison with one of my ref 2337 examples on the left:

Although it is a centre second dial you can see the similarity in the layout: with zone and the same shape of the radially orientated numerals (here with fully intact lume though).
Disclaimer: All photos for comparison from my chronometre book.

mac_omega

Lumed dials of this age often have lost most of the luminous material and the numerals look like metallic foil. The rough structure on several numerals made me think of this possibility. The photo is not sharp enough to make a final decision. You have to look at it with a 10x loupe or/and expose it to UV light and see if there is some luminous left. Even with radium lume there might still be a very faint glow visible.

I want to demonstrate the loss of luminous material on 2 examples of ref 2410

You can see the starting of lume loss on the left example and in the right example nearly all of the luminous is gone except tiny rests at number 6 and 8. Without these minor residuals you might think the dial was designed with metal foil numerals only. Sometimes the rest of luminous can be hardly seen. When assessing dials I rely on my experience and go from the dial design - OP´s dial might have started as a luminous one...

Here you have a comparison with one of my ref 2337 examples on the left:

Although it is a centre second dial you can see the similarity in the layout: with zone and the same shape of the radially orientated numerals (here with fully intact lume though).
Disclaimer: All photos for comparison from my chronometre book.