Hello,
I posted this over on the Tissot sub forum and did't get a response. I'm wondering if the 20mm deployant clasp used on the Tissot Heritage Navigator 160th Anniversary can be ordered as a spare part? I sent an email to Swatch Group USA a few days ago, but they haven't proven to be helpful. I emailed Tissot, but I haven't heard back yet. Here's a photo of said clasp: