by Kitagawa Hanbee北川半兵衛商店
The official Japanese product page labels Senju Mukashi as an Urasenke-preferred koicha and lists Kyoto Prefecture origin. It is sold in 20g, 40g, 200g, and 400g tins.

Editorial verdict
An explicitly koicha-oriented tea ceremony matcha with formal Urasenke positioning, making it one of the clearest ceremonial use-case products in the range.
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Kitagawa Hanbee official store Senju Mukashi product page — 祇園 北川半兵衛
Supports: 20g price 2722.00 JPY; Kyoto Prefecture origin; package sizes 20g/40g/200g/400g; official product availability.
About the brand
北川半兵衛商店
Founded in Uji in 1861, Kitagawa Hanbee is a long-established Kyoto tea wholesaler whose official Japanese site emphasizes strict quality control, tea-ceremony matcha, and a current retail footprint under the Gion Kitagawa Hanbee name.
View all Kitagawa Hanbee blendsSenju Mukashi is priced at ¥2,722 for 20g (¥136/g).
Senju Mukashi is recommended for koicha. Thick tea — a concentrated preparation using about 4g of powder and 30ml of water, reserved for the highest-grade matcha.
You can buy Kitagawa Hanbee Senju Mukashi directly from Kitagawa Hanbee's official website. Current availability: in-stock.