Here is a Japanese Navy Deck clock made by Seikosa that later becomes Seiko as we know it. It a well-made clock. Runs for eight days. A photo of one on a Japanese Navy destroyer in the engine room. I started to collect a Naval clock form all navies of WW2 American, British, German, Japanese, Italy did get an Italian Navy deck clock but think it might be from the 1950's will post it and maybe someone can tell me the year used. The movement has movement parts painted and a cover over the regulator to protect against salt water and weather it's in great shape almost mint.

 

Great piece.  Rich A. in Pa.

Watch in very good condition!

 

The characters written on this watch are "【一週間捲一型乙】Ichisyukan-Maki-Ichigata-Otsu".

"【一週間】Ichisyukan" means one week, "【捲】Maki" means winding a screw, "【一型】Ichigata" means type 1, and "【乙】Otsu" means the second grade.

 

I'm not familiar with watches, but I've heard that the mainspring mechanism is different from the first grade.

It has the title printed on it without just the letter "乙" and is about 2 inches extra thick.

 

By the way, do you have a picture with the lid open?

When I saw the same type of watch a long time ago, I saw letters printed on the underside of the dial and letters engraved on the underside of the outer frame.

Looking at the letters may reveal more detailed production plants and types of warships.

Thanks for the information.  They made some nice timepieces for their military; there best deck clock was one with a fusee movement the movement made before the war looks like a piece of art. But material got scarce during the war mine was one of the better later 8-day movement after the fusee type they got worse later in the war like my case is brass think they were aluminum around the end of the war. Wished I had a fusee one. Some later were one day movements if I remember right. There is a button on the left side of the case you push it the bezel pops open spring loaded. To get to the movement there are a few screws on the dial you remove the dial the movement screwed onto the dial. You set time by using your hand to move the hands to set the time and a key to wind it. There's a YouTube video that shows a fusee one getting serviced I would post it, but the forum seems to not let you post links. You can look for it on YouTube he services two different types that were well used they turned out great.

On YouTube look up James Matin a clockmaker who cleaned a prewar fusee Japanese naval clock and another later war deck clock when there was a material shortage even used wood in the clock both dials and mine has English made by Seikosa Tokyo Japan. And the few that were posted at the MWR forum the same. So would the letters you are talking about underside of the dial.

Thank you.

 

I saw the YouTube video you mentioned.

 

The watches he repaired are a different type that needs to be wound every day, but I imagine the main structure is similar to yours.