Rolex daytona testing dial name?

[marcinflair]

Guys,

Some time ago i was lucky to buy few daytona movements. I sold them but i left one for myself and its keep bugging me why did they fly out so quick,

I want to do more investigation on the dial if anyone here can help,

I got them from a retired rolex worker with some more amazing items but this Daytona testing dial give me sleepless nights.

I knoz there is a name for it and thats what im looking for, i tinks its a combination of 3 letters.

Can ayone help identyfying this please chaps?

Here is the pic

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