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Bifora 55

 

Bifora 55Bifora 55

Description

Die 5 1/4 ligne Bifora 55 is an early ladies' form watch movement from Bifora.

It sill has got the classical design with partially angeled bridges, a scale on the balance cock and a stripes decoration.

 base platebase plate

The base plate is massive and has got the typical construction of small form movement where the gears and bearings partially overlap each other.

Of course, all bearings, except those of the minute wheel, contain rubies. In some models the minute wheel has got ruby bearings, too.

gear traingear train

This movement has got really small third and fourth wheels, the third wheel has got a very long axle. That is not very watchmaker-friendly, but there's no other way due to the limited space.

The large escapement wheel partially runs below the fourth wheel bearing, so, it's the two-storey construction, which is typical for that kind of movements.

side view of the gear trainside view of the gear train

The screw balance is not shock protected and beats with 18000 A/h. The minute wheel is directly driven by the mainspring barrel.

Bifora 55 dial sideBifora 55 dial side

On the dial side, there are no surprises, but you still find the yoke winding system, which Bifora pared down in later movements in favor of the cheaper rocket bar winding system.

 

 

 Technical data

ManufacturerBifora
Caliber55
Number of jewels15,17
EscapementAnchor with pallets
BalanceNickel screw balance
Shock protection(s)none
Balance cock directioncounterclockwise
Hairspring studfixed
Regulator typeLong regulator arm
Movement constructionFork
Escapement wheel, Fourth wheel, Third wheel, Center wheel
Mainspring barrel
Construction typesolid construction
Winding mechanismyoke
Setting lever spring2 holes
FunctionsHour, minute
Beats per hour18000
Size51/4 x 81/2''' (measured: 12,8 x 19,3 mm)
Image in Flume Werksucher 1952 32
Bifora 55BiforaBifora555 1/4 ''' 8 1/2'''Bifora 5515,17 Jewels, 5 1/4 x 8 1/2''', 18000 A/h
Factsheet

  

In the lab

Unfortunately, the specimen shown here is not shock protected and so suffers of a broken balance staff. Hence no service and regulation was made.

 

Usage gallery

Bifora Ancre ladies' watchBifora Ancre ladies' watch

 

Many thanks go to Mr. Keilhammer for the donation of that movement!