Hi Simon. I'm trying to replace my dad's watch gasket. Tissot wont supply me with one. There is a red hard flat gasket which is thoroughly mangled and will not fit back in, It also seems too long, (The battery was changed by a shoe shine chain a few years ago and my elderly dad didn't realise the back wasn't on properly when he got it back!) I've tried Cousins but they seem wholesale only so I'm hoping to get the measurements to get a third party one. Are you able to help with measurements please? Thanks in advance, Andrew.