Nissan/Datsun brake master cylinder made by Beck/Arnley, item number 072-6570. Fits the following;
* 1979-1982 Nissan 210
* 1979-1980 Nissan 310
* 1978-1981 Nissan 510
* 1978-1979 Nissan 620
* 1977-1980 Nissan 810
$100 shipped obo. I live in Portland if you'd rather pick it up, PM or email me if interested.