
The archaeologists, from the Berlin State Office for Monument Preservation, found the rusty sword amid World War II-related rubble dug up from cellars buried beneath the Stralauer Straße in the Molkenmarkt ("Whey Market") area, a translation of the announcement revealed.
Initially believed to be a WWII parade saber, the sword was later found during restoration work to be a fragmentary Japanese short sword called a wakizashi, according to the statement.

The wakizashi's guard plate bore a detail comprising chrysanthemum and waterline motifs, one of the photographs of the sword published in the statement showed.

"This discovery shows once again what surprising objects are waiting to be discovered in Berlin's soil," Matthias Wemhoff, State Archaeologist of Berlin and Director of the Museum of Prehistory and Early History of the Berlin State Museums, reportedly said.
"Who could have imagined that at a time when Japan was isolated and hardly any European travelers came to the country, such a long-used and richly decorated weapon would end up here in Berlin?" he added.
The wakizashi probably ended up in Berlin through Japanese ambassadors on the Takenochi Mission to Germany's Wilhelm I in 1862 or the Iwakura Mission ambassage 11 years later. "The spatial proximity of the Molkenmarkt with its surrounding aristocratic palaces to the Berlin Palace suggests this," the statement noted.
The wakizashi means "side-inserted" sword as it is worn at one's side and is about 1-2 feet long, according to Ogyū Sorai, a 17th-century Japanese Confucian historian and philosopher. Used as an auxiliary sword by the samurai, the wakizashi could also be used to commit seppuku, a Japanese ritualistic suicide, Sorai observed.
Excavations at the Molkenmarkt, Berlin's oldest market square, also revealed Berlin's oldest street underneath the modern-day Stralauer Straße back in Jan. 2022, according to the European Heritage Tribune.
Comment: From the original article (machine translation):