Family heirloom

Maybe you can put it in a glass case and have it displayed on a table with framed photos of older generation’s weddings, or photos of you and your fiancé as children or when you first met, etc.

Maybe you can somehow embed it in your bridal bouquet?

Perhaps you could have photos taken wearing the watch, and then display a photo of you wearing it and one of your grandfather wearing it in a side-by-side frame. Or, you could get your photographer to snap a few special photos of you wearing it before the ceremony

I love the idea of incorporating it into your bouquet if possible! Maybe carefully wrapping it around the stems? Otherwise, you could get a glass case for it and have the ring bearer carry it down the aisle?

If you wanted to get it incorporated in the bouquet, you could have it wrapped into the stems. If you look up 'wedding bouquet photo frames' on Google, think like that! Or maybe having a pocket sewn into the inside of your dress, then you have your "something old." That might be a less visible way to make it a part of your day, but make sure it gets into the detail shots with your accessories.

You could that as part of your themed and call it something like timeless love or together til then end of time etc and display different clocks and watches