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AHO 675

AHO 675AHO 675


The AHO 675 is medium sized (6.75 lignes, hence the name) form movement, which was built in a cost-efficient pier construction.
It is a true pallet lever movement with 17 jewels (one on the dial side(!) for the escapement wheel).

The AHO 675 uses a two leg, not shock-protected screw balance; its hairspring is fix connected with the balance cock and can be regulated in its effective length directly at the hairspring key only.

dial side viewdial side view

At "9" you see, that escapement wheel and the axle of the fourth wheel overlap each other. On a massively constructed movement, it would be quite easy to achieve, but since we have got a pier construction here, the dial-side bearing of the fourth wheel had to be realized by an own cock. On the following side view, you can spot it, together with its two fixation screws.

Besides this, there are no surpriseson the dial side: The cost-less rocking bar winding mechanism (with a suprisisingly well made click mechanism) matches the pier construction.

side view with fourth wheel cockside view with fourth wheel cock

 Technical data

Number of jewels17
EscapementAnchor with pallets
BalanceNickel screw balance
Shock protection(s)none
Balance cock directionclockwise
Hairspring studfixed
Regulator typeHairspring key
Movement constructionFork
Escapement wheel, Fourth wheel, Third wheel, Center wheel
Mainspring barrel
Construction typepillar construction
Bridge shapeCurling, handle left, 4 gears
Winding mechanismRocking bar
Setting lever spring4 holes
FunctionsHour, minute
Beats per hour18000
Size63/4 x 8''' (measured: 15,5 x 18,2 mm)
Image in Flume Werksucher 1957 48
AHO 675AHOAHO6756 3/4 ''' 8''''''AHO 67517 Jewels, 6 3/4 x 8'''''', 18000 A/h


Timegrapher output

In the laboratory, this, approx. 50 year old movement, gives surprisingly good results.

It runs very clean and without depthing error. Even the beat error is rather low, as well as the positional differences, which indicate a very well poised balance and good maintenance - in the back of the tested watch there are three watchmaker signs. Only the massive slipper at position "6" at the end of the test (only there - at the beginning of the test, it showed completely normal results) cannot be explained.

crown rightcrown right crown topcrown top crown leftcrown left crown bottomcrown bottom 
dial topdial top dial bottomdial bottom 

Usage gallery

Constanta ladies' watchConstanta ladies' watch

This movement was donated by Klaus Brunnemer. Thank you very much!