Why would one need to show warranty card or receipt after 2018? Just curious as the procedure or policy has gone backwards technology wise.
If it was bought after July 2018 it's still under warranty but you'll need your warranty card or dated receipt, if it was bought before July 2018 it doesn't matter.
Not sure what you mean by it running down more quickly over 24 hours. Is it stopping after 24 hours? If so the question to be asked is, are you fully winding it (until the crown won't go any more)? Pretty unusual to have a three year old Speedmaster crap out with mainspring issues.
Just checked. Was bought in Jan '18 and I do have the paperwork. And a part of me wondered if I've just not been paying attention to which days I've wound, but now paying careful attention it does seem to be winding down in 24 hours.
Thanks for your response: Yes, it's unusual. I'm winding seemingly to the same amount of tension and where this would once last for 48 hours it's now just 24. I never wound it until it wouldn't go anymore, but almost so.
Wind the watch every day until the crown won't turn anymore, that's the only way you'll know you are starting with a fully wound mainspring. Counting turns of the crown, or until the tension feels about the same, or winding it every other day just aren't good, consistent methods for a manual wound watch. The watch will not break when you wind it fully and I suspect you really don't have an issue other than you weren't starting with a fully wound watch.
