Not many of these about! This is the Lanco version of the Tissot Astrolon - which arrived today. It works well, but I know these are unlikely to last forever so it won't go out too much.
I think the Lanco version is probably rarer than the Tissot - Tissot acquired Lanco in 1970 or 1971 (I believe). This is probably 1973 or thereabouts. The movement is the 2270 variant.