A local thrift store has two K&E planimeters for sale. One has a 620000 logo and appears to be complete and in near mint condition. The second does not have an identifying logo but the hardware is very similar to the first. There may be some missing accessories. It is also in near mint condition. Each device has an asking price of $125 which seems to be a little steep to me but it may be negotiable..

I am personally not interested as I already have an Aristo No. 1130L for my collection.

The asking price does seem to be on the high side, particularly if they're later model compensating polar planimeters that don't come in a wooden case.