The museum does not have any records of production numbers for any Tektronix product. The 1980 Annual Report had this on page 25 noting that Tektronix had shipped it's millionth oscilloscope.
The undated issue 25 of Tek Times, presumably from January 1981, had this article on the accomplishment.
As noted Tektronix had several manufacturing sites for oscilloscopes. In 1954 Tektronix started producing their own CRTs and they were only produced at Sunset and then Beaverton. This represents a lot of glass and ceramic CRTs produced!