Hi. I've got recently this Mk1 and this is by far the most earlier model I've ever had. The serial number is 14,711 and the bottom does not have a small hole for adjusting the time. The watch looks like it no one hase worn it at all.
I can see the batteries have corroded the surroundings but I but it under the ligth and for mi BIG surprise the watch did light up. The segments are all there and for the very brief moment there was time as well but then it went dark. I was so surprised that the old batteries did work at all.
Now there is just random numbers and colons light up so its probably quarts circuit that has corroeded as well...!?
I will wait another couple of days and try to charge it before I open it up and try new batteries.