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Kern 400 Day suspension clock Repair/Restoration

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My first 400 Day suspension project which I collected from a nice gent local to me, base brass work was in quite a state so that has been stripped and boiled in a pan of water to remove the laquer and is polishing up nicely. The movement is in great general condition though it seems to have been oiled weekly as it was dripping in oil, escapement works as it should and the mainspring is in good condition, hopefully a good service and clean plus the replacement of the suspension spring which is about 1 cm too short.

As I am still trying to get hold of the "400 day clock bible" I could do with a little help with identifying the clock for the suspension spring measurements and thickness.
As per the title this is a Kern clock with the KS logo with the winder on the right, backplate dimensions are 60mm x 44mm.
See photo attached (hopefully). 
Thank you for any assistance.51172798826_9a726830e0_b.jpg

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