Re: Clock IC?
I don't think you will find a direct equivalent to the MN6251 these days - here are two equally hard to find modern clock ic's - H1344 & EM1537.
Assuming it is faulty is there the possibility of:-
Replace the whole movement with a modern after-market quartz clock movement.
Removing the pcb from a modern movement and grafting that in the place of the old one.
If all else fails and the clock must be made operational, then there are diy projects out there to build the clock movement electronics.
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