This has been on my wish list for some time so happy to see this in the post this morning. Nice example of a uncommon large 37mm diameter constellation. As these only lived in the far east the dials normally have some patina. This example has a great condition dial and hands. The crown is a later replacement but that can be corrected at service. Now for around the back and inside. Correct case back style with wide step and medallion in very good crisp condition. Inside the caseback has the expected reference marks. Case has a fantastically gooey seal. The movement is in great condition with low 17mil 504 movement. I estimate it is late 50's or early 60's but an extract from the archives will confirm.