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:
40.RSL.R
MB&F Horological Machine N°4 HM4 Thunderbolt Red Gold
42.BTSL.B
MB&F Horological Machine N°4 HM4 Final Edition
40.TSL.B
MB&F Horological Machine N°4 HM4 Thunderbolt
41.TSL.BDT
MB&F Horological Machine N°4 HM4 Double Trouble
41.TSL.BRD
MB&F Horological Machine N°4 HM4 Razzle Dazzle
41.TSL.OW
MB&F Horological Machine N°4 HM4 Only Watch
40.TSYL
MB&F Horological Machine N°4 HM4 Thunderbolt Yellow Gold