Mark 11 manufactured 1948

Good afternoon, I am looking for clarification on the dial of my vintage Mark 11.
The watch has an IWC certificate (in German Language) stating that movement, components, case are original and date back to 1948.
Nothing is said about the dial which shows(above six hours) a capital T inscribed in a circle. I would like to know if the Tritium symbol was used also in 1948 or, instead, it started being displayed only at a later date.
I would be happy to post pictures if someone kindly teaches me how to copy an dpast them into this blog (I am afraid to be almost a web illiterate).
Thanks in advance, Aco

The encircled T was adopted later than 1948, and the dials were substituted during service. I believe there are some discussions about this in the archives, which can be searched via the upper right magnifying glass.

Michael, search completed: it would seem the T symbol was introduced in 1963. Would you consider as being original a watch whose movement, inner components and case are clearly dated 1948 if the dial (and I presume the hands as well) are of a later age ?
Regards, Aco

Ps: any tip on how to post photo's on this blog?

Here you go.

[](s95.photobucket.com/user/wbarker75/media/HowtosavePhotoinPhotobuckeMethodsRevised3_zps5fffe518.png.html)

ACO,
If you have searched the Forum archive, you must have noticed why also the very early Mk 11 watches have a Tritium dial with the encircled T.
There was a stringent demand from the British authorities that that military watches with an original Radium loaded dial would be destroyed or that the dial should be exchanged for the much less dangerous Tritium dials. This was also true for the earlier W.W.W. watches of which there were 12 different brands, among them IWC. In none of the British military museums is one watch present, equipped with a Radium dial. So when they came at service, the dials were taken off as well as the hands to be exchanged. It is nearly impossible to find a 1948 Mk 11 with Radium dial, but they exist. It means that these watches have not been offered for service, but possibly ended their military life in a drawer.
Among collectors the Mk 11 with Tritium dial is considered as completely authentic, which is not the same as completely original.
Kind regards,
Adrian,
(alwaysiwc).