
Tissot or Buler is tricky. Both brands are owned by same conglomerate. Case by Buler, sold under Tissot line?
This quote from an article at www.watchipedia.com sums it up nicely.
"Following this huge success, the Bertone Studios were asked in 1975 to design approximately 15 watches under the name "Stratos." And they did. Tricky thing is that it is not entirely clear which brand they were designed for. Tissot claims them in their 150-year anniversary book, but in the book "Watch" by Mr. Doensen—which has a large focus on 1970's designers, watch designers, and 1970's technology—these watches are claimed to be designed for the Buler watch brand."