You are probably within a year. Buler is an old, well known company, but not generally big enough to make (or have made) custom movements. Or even cases by that time. More of a collector's curiosity - but a very nice piece regardless.
The connection to Buler with those Bertone designed LEDs - that has been quite effectively
squashed by those who have noted that Tissot lays claim to those in their "History of Tissot" books, both text and pictures. The Buler connection was merely a rumor that spread until it was considered gospel.

I believed that connection myself until shown some definitive proof otherwise.
http://www.retroleds.com -
Sales of vintage LED, LCD, analog watches,
parts and gadgets -
repair tutorials & tips
Nov. 2022 - back in business!! BItter divorce is in home stretch, come grabs some great deals, I had to open the safe . . . damn attorneys. piss.