u/Carnal-Malefactor

I inherited this Seiko from my grandfather many years ago. He got it as a gift from his company for working 30 years there, I think this was in the 70s or 80s. I still have the original case and guarantee card, but I can't find a specific model or any info about it. There's nothing in the back plate which I found odd but I'm sure the watch was never tampered with.

I plan on using it for the first time at my wedding in two months and I just got curious about it. Thanks!