Ok so it's seikotime. This is another "bitser" that I've made up. I went through a phase of these things. It's an early 1960's seiko 8306 Sealion that I made up from my parts bin. The movement is a low /hi beat (pending on how you look at it at 18000) 30 jewel unit. Probably it's most interesting feature is the winding mechanism. You can hand wind it or it self winds using a fairly complex, but very smooth and compact inversion roller type mechanism. A nice change from the "magic arm" so common in seikos. I just couldn't find any more original dials so it got a Seiko 5 pilot type one and grafted it onto it. It doesn't really reflect what's under the hood (but I know and that's what counts), but it's produced a nice daily wearer.