This is the side-pull brake that the brand name "DIA-WEINMANN" was stamped.
No. 500, No. 730, and No. 810 were prepared in order of bottom size from shoulder.
It was used for a lot of domestic sports bicycle.
Katakura Silk which was my first custom made bicycle was equipped with No. 500.
Of course, the mark was no longer DIA-WEINMANN.
Even now, No. 730 and No. 810 are on the line-up of Yoshigai (the design was changed a bit).
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