Was PuristsPro founded in a particular city? If so, then how about if we were to designate that city on the dual time wheel (perhaps in a special color, like red). This is similar to what Lange does with the Timezone Watch for the special concours event it hosts in Lake Como, IT.
Alternatively, if no such “founding city” could be designated, how about if the city designated for the Central European timezone was Vallee de Joux? That would be ultra cool!!!
And, of course, for either version there could be a purists inscription on the underside of the watch along the edge of the case back. (I do think it should be a clear case back).
Something like the above on a JLC Geographic would be very exciting to me.