This is a used Shimano upper headset from the late 1980s / early 1990s 

It fits frames with 1 inch headtubes and is for threaded steerer forks.

There is slight corrosion on the lower part of the race (see 5th photo), but this is very minor and it still turns smoothly.

The upper part of the race is in good condition.

The bearings are smooth.

Very good overall condition and perfect workiong order.

Thanks very much for looking. Please check out my ebay shop for loads more bike stuff.