See also https://asiamedals.info/threads/1926-mannensha-co-ltd-new-building-construction-commemorative-table-medal.29654/
Silver medal.
Size 75.8 mm.
Weight 184.27 g.
Reverse
昭和五年六月一日 - June 1, 1930
創業四十周年記念 - 40th Anniversary of Founding
前進 - To Advance; To go forward
株式会社萬年社 -...
1930年株式会社萬年社 創業四十周年記念牌
40thanniversaryoffoundingmannenshaco.40thanniversaryoffoundingmannenshaco. medal
japanese table commemorative medal
昭和五年六月一日株式会社萬年社 創業四十周年記念牌
造幣局製
造幣局製 made by the mint
造幣局製メダル