I never had the chance to take the watch apart and look behind the dial of a tri-compax. I saw this on eBay, anyone had the chance to look at what a proper dial should look like on the backside before? Could you please kindly share your thoughts?

Edit: I do think the dial being offered on eBay is not genuine btw (but this type with the blue on the outer rim I always seem to always be wrong with my assessment)

 

My Compax



That dial looks good to me apart from the "Universal Geneve" writing that looks a bit thick, but again I'm no expert!

In terms of the blue on the outer rims, please see the original example below.

 

Just like with plumbers, I try never to look at the back side

 

the genuine article. This dial type generally has a thicker logo font and the faded hyphen. Correct dial post placements

 

You are not the only one there, @ELV web
I just made a wrong call as well. I am surprised that the location of the is situated so close to the cutout.

 

It's identical to the dial on P336 of Sala, but I must admit that I'd looked at the OP one a couple of times and always been put off by the heavy inking on the logo. The "SWISS" also looks a bit wonky, but that may just be the plastic bag distorting the picture.

 

Mine looks like this, I am a little concerned about the scratches but Blake at Scotchwatch felt it was all normal.

 

I had a look at it too...
But doesn´t look genuine to me. Letters at Universal Geneve should be more slim.
I decided to leave mine as is. It´s O.K. to show your age if you are 70+

 

This one looks suspicious to me, sub dial overlapping with the outside track is never a good sign.

 

Also from the above, it doesn't look like there is any obvious signing pattern behind the dial of UG and it is only on the front side that one could hope to verify their authenticity.