There were at least 28 different watchmakers who produced wristwatches with 36000 VPH movements in them. Of these 12 produced their own movements and the rest purchased movements from either A. Schild, Eterna, or Zenith.
 
A. Schild developed one high frequent movement (Cal. AS 1920). It was used in Hamilton, Lucien Piccard, and Mido 36000 VPH watches.
 
Zenith produced the 3019 PHC, the only high frequency automatic chronograph ever produced. Zenith continues to produce this movement today (now known as the cal. 400) , along with a manual wind variant (cal.405) and a full calendar and moonphase chronograph (cal. 410) version. The cal. 400 is also currently in use in the Tag Heuer Calibre 36 chronograph.  
 
Movado produced the 405 (day/date) and 408 (date) automatic watch movements for use in their Kingmatic watches and in Zenith's AF/P (Alta Frequenza/Precizione - High Frequency/Precision) watches.
 
Felca, now called Titoni, manufactured their own high frequency movement(s) for a period of time and later on utilized ETA 2888 movement.
 
Eterna sold a few different movements (Cal. ETA 2824, 2826, 2832, 2834, 2837, 2888) to Waltham, Ulysses Nardin, Technos, Glycine, Cyma (Synchron), Borel, and likely all the other brands which cased 36000 BPH movements, that are not identified as having gotten their movements from A. Schild or Zenith in the preceding two paragraphes. As the largest Swiss manufacturers of mechanical movements during the heyday of these watches, Eterna movements were often a combination of modules applied to different base movements to achieve different specifications and features. The clearest example of this is the ETA 2824 movement which is probably the highest volume Swiss automatic movement currently in production and for which Eterna produced a 36,000 VPH kit. This means that the movement caliber can not be relied on to identiify an Eterna 36000 BPH movement watch and the only way to know for sure that a watch has a 36000 VPH movement is to put it on a timing machine and verify the frequency of the movement.
 
As the mechanical watch industry and in particular the Swiss mechanical watch industry was reeling from the advent of inexpensive high accuracy quartz movement watches from Asian manufactures, in some cases, makers produced virtually identical watches under different brand names after consolidating or through outsourcing. Indeed for an industry built on craftmanship, these were dark days.