MB&F caliber HM4
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HM4 description
Three-dimensional horological engine developed 100% by MB&F
Manual winding with two mainspring barrels in parallel
Power reserve: 72 hours
Balance frequency: 21,600bph/3Hz
Number of components: 311
Number of jewels: 50
All watches using the MB&F HM4 movement:
![MB&F Horological Machine N°4 HM4 Thunderbolt Red Gold (40.RSL.R)](https://cdn.watchbase.com/watch/md/mb-f/horological-machines/40-rsl-r-1.jpg)
40.RSL.R
MB&F Horological Machine N°4 HM4 Thunderbolt Red Gold
![MB&F Horological Machine N°4 HM4 Final Edition (42.BTSL.B)](https://cdn.watchbase.com/watch/md/mb-f/horological-machines/42-btsl-b-8e.jpg)
42.BTSL.B
MB&F Horological Machine N°4 HM4 Final Edition
![MB&F Horological Machine N°4 HM4 Thunderbolt (40.TSL.B)](https://cdn.watchbase.com/watch/md/mb-f/horological-machines/40-tsl-b-27.jpg)
40.TSL.B
MB&F Horological Machine N°4 HM4 Thunderbolt
![MB&F Horological Machine N°4 HM4 Double Trouble (41.TSL.BDT)](https://cdn.watchbase.com/watch/md/mb-f/horological-machines/41-tsl-bdt-65.jpg)
41.TSL.BDT
MB&F Horological Machine N°4 HM4 Double Trouble
![MB&F Horological Machine N°4 HM4 Razzle Dazzle (41.TSL.BRD)](https://cdn.watchbase.com/watch/md/mb-f/horological-machines/41-tsl-brd-5e.jpg)
41.TSL.BRD
MB&F Horological Machine N°4 HM4 Razzle Dazzle
![MB&F Horological Machine N°4 HM4 Only Watch (41.TSL.OW)](https://cdn.watchbase.com/watch/md/mb-f/horological-machines/41-tsl-ow-7c.jpg)
41.TSL.OW
MB&F Horological Machine N°4 HM4 Only Watch
![MB&F Horological Machine N°4 HM4 Thunderbolt Yellow Gold (40.TSYL)](https://cdn.watchbase.com/watch/md/mb-f/horological-machines/40-tsyl-7.jpg)
40.TSYL
MB&F Horological Machine N°4 HM4 Thunderbolt Yellow Gold