Do you know what is VPH or BPH?
VPH (Vibrations per hour) and BPH (Beats per hour) is the same thing. VPH(Vibrations per hour) is a common notation for movements in watches today and can greatly help in deciding on the quality of a timepiece. I would share it with my fellows. Basically it breaks down to how many times a watch will tick in an hour, if you hold your mechanical watch to your ear and listen you should hear a rapid “tick-tick-tick-tick-tick-tick”, each of these ticks are what counts toward the VPH when calculating the frequency of the watch.
18,000 VPH or 2Hz (Classic manual wind movements)
19,800 VPH or 2.5Hz (Cheaper Chinese movements)
21,600 VPH or 3Hz (Lower frequency for automatics or manual wind) – Most of the Japan Grade watches are 21600bph
28,800 VPH or 4Hz (Most common automatic movement, can also be speed of a manual-wind) – The best replica watch use Swiss ETA movement which is 28800bph. Original Tudor watches are 28800 bph.
36,000 VPH or 5Hz (Advanced movement, El Primero Zenith – in some Rolexes and TAG Heuers) – Not available in replica
43,200 VPH or 6Hz (Advanced movement, Audemars Piguet ChronoAP) – Not available in replica
72,000 VPH or 10Hz (Advanced Automatic Movement Rate “Breguet Type XXII”) – Not available in replica.