Hi I'am new here so first of all I shall say hello! it looks a great forum and as I have 2 Tag Heuers hopefully I can get involved with the many discussions here.. So my most recent watch incoming is a classic Tag Heurer 1000 - 980.013N, I always wanted one and have started to clean it up, give it new seals and gaskets, a new battery, cleaned the inside of the crystal etc. When removing the crown/stem I had to clean off a black tar like matter which I imagine is a seal/gasket that has degraded but I cannot see where this sits within the stem and cannot find anything online about these seals/gaskets? Can I get a aftermarket seal from somewhere like Cousins, if so what size should I be looking at? Would appreciate if you can point me in the right direction and I'll post up pictures of the progress. Thanks again..