edwin777
210
Now I'm a bit confused
I did months of research about this thing and for the various versions...
If I'm good, so there are 2 ( or 3 ) different make of this bakelite insert !
- a radium with strontium activator "original" ( radio active ) soon replaced by
- a service with zink sulfide with tritium as activator ( no radio active or very faint as 0.16 peak microsivers I did measure ) ?
- another version more recent was then ....( ceramic ? )
+ all the after markets and copies...
As this one still shine very well in the dark under UV, and is not radio active, it's the 2nd version in time
The bezel ring around is also another one than the most seen on 6542, as it's crenels are quite particuliar, with a different crenel every 5 one.
I could locate at least two likely same bezels on the internet :
One sold on antiquorum NY 2014
another one on a watch sold in AMS by watch company.
Not many people are able to tell, obviously older ones who were concerned at the time are mostly passed over, as my dad.
But I really want to ID the part in a 100% certain way. Sooner or later.
Thank you for your help and details, added to this post.
best regards
Edwin