RD250LC fork brace of unknown manufacture, but it's definetly period.

Looks pretty much like this ebay one...

http://www.ebay.co.uk/itm/Yamaha-RD3...cAAOSwYvFZM-1a

Here's mine...

https://www.flickr.com/photos/153928.../shares/qb6d17

I reckon 50 posted.

It's going on t'bay tomogga.