• My place is 60s too - era do a knob pretty similar - zoo hardware also have options. Nickel is a warmer finish than SS if you can get it. Poole & Waite in Farringdon is a trade place that can source stuff. Mid cent is tricky for things like handles I find / as you say - most affordable options skew to Victorian / 30s or made up ‘modern’ horrificness. IZE - do super fancy architect designed stuff.

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