Tissot Sideral automatic watch

Tissot was a big innovator in the 1970s, especially when it comes to case materials, and this watch, unlike normal, has fiberglass case, which makes it really comfortable on the wrist. Crystal and dial are in good condition. Case shows signs of age and use, and the crown is original. Rubber strap is appropriate for the era. Service history is unknown, but the watch works, the date is working, and the watch is running approximately +- 30 seconds per day.