This is a King Seiko 56KS with a cushion case, Roman numeral indices, and no date. Based on the engraving on the case back, it appears to have been manufactured in July 1972. As you can see from the photos, it's a medallion-less model, but from a practical standpoint, you don't have to worry about corrosion, so you can use it without hesitation. The lug width is 19cm, and it currently has a Morellato embossed crocodile leather strap. I purchased it about six months ago, and at that time I was told it had been overhauled around 2022. Since it's an antique that's over half a century old, those who are concerned should consider an overhaul after purchase. I'm reluctantly selling it to organize my collection. I hope someone who will cherish it will purchase it.