This is the first domestically produced chronograph pocket watch released by Seikosha. It was not generally sold and is said to have mainly circulated among officers. It is a one-push chronograph with a 30-minute totalizer. It has 17 jewels, which is a relatively high number for a Japanese-made pocket watch. The exterior has some plating wear, but it's not too bad. The glass has been replaced with a new domed glass. The mechanical condition is also relatively good. It has been disassembled, cleaned, and oiled, and is running with an accuracy of about 30 seconds per day when laid flat. The chronograph function has been confirmed to work when the mainspring is wound. Setting the time is also not a problem. This is a very rare watch, so please refrain from price negotiations.