Welcome to the forum glad you have found your answers fast, but dont forget to read a bit and use the search function, you have no idea the info in this place.
I would say you have some moisture in the case, get a small tupperwear box, fill it with silica gell packs take the back off the watrch and lock it away for 24 hours, take it out and seal it up again, making sure you check all seals and lube them. You may get away with just opening the crown but i am sure it is better to get it totaly dry.
Hey how do you like that then Stephane, i have one an love it i just have to get the lello date wheel and fitt it as mine is a bit off centre, i love the size of it and its weight, i think it has a "touch of class!" too.
Rather than just bomp this i thought i would ask if there are any problems that might crop up with repping this one, ie is it too thin? or large or has a non standard date wheel, any thing at all that may be a problem?????
This is not the case, the 100 on the bezel or in the rehaute is not to messure miles an hour or kilometers,. the same tachy scale is used for both, all you are are doing is mesuring a set number or UNITS per hour, , be that miles, km, liters any thing. The markings from 0 to 100 covering a full circle on a watch face no mater what watch is to give you a rough guide to decimalised time when making speed time distance calculations.
Getting a UPO bracelet to fit a silix po is a real pain i had to elongate the holes in the bracelet and also bend the spring bars, it took me a couple of hours but is solid now and has been since i made it.
Bear in mind that the tachymtre is not just for miles per hours per hour but for units per hour, if you travel 1 kiliometre in 60 seconds you are traveling 60km per hour. also if you fill 1 liter of water from a tap in 60 seconds then your tap will give out, 60 liters per hour, or as mine at home 1 liter in 10 seconds then that is 350 liters per hour.