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0.25" square X 0.19" high. Leads on 0.15" X 0.25" centers.
This is commonly called a "6x6mm type" switch.
High quality, Made in Japan by ALPs
Possible alternate to part number: CAT# PB-126
New old stock. This appears to be a custom part number exactly identical to part # SKHHAKA010 found in the datasheet below.
Similar Switch Datasheet in PDF (SKHH-1370651.pdf)