ADVICE on DRSD tropical brown Mk11 dial 1969

[Davef1969]

I would like your expert opion on this particular DRSD Mk11 tropical brown 1969 model please...
it is currently on e-bay: seller is luxwatches308, based in Spain,
it is advertised for £18k with no box or paperwork!
all original? no alterations...
I have looked through various websites for authentisity!!
a lot of information to go through so I thought all your vast knowledge and expert eye to detail could again guide me in the right direction...
The only thing I can question is the date 'closed 6 & 9'?? is this correct for a mk11?
Thankyou for your time....maybe I can purchase this one?