Watch Hamilton 14k Gold Vintage Thinomatic - No Monogram

This manual wind watch was my grandfathers and he purchased it new. Unlike a lot of others on here there is no service monogram. On the back it is inscribed with "14K Gold".
It appears this is the original band, but I'm not sure as you can see it's got some "worn" spots on the close-ups. On each inside link there is inscribed "Speidel 2689450". On the last inside link connected to the watch it says "Spiedel stainless steel caps".
Yesterday I set the time to match my quartz swiss army watch and 24 hrs later they both match. I can't attest to the accuracy though. It's been sitting in a drawer for about 20 years, so it probably needs to be serviced. If you need me to take some more photo's to clear up any question you might have, just let me know. I only want to take paypal for this and limit to the USA.