My father took it in the 50s. I vaguely remember him saying decades ago that it is taken in Schuster’s hall. Our comrade Pinchas B. says it has the same chairs as pictured in an early picture of Schuster’s Hall in the “Rav Breuer” book (top photo on the page following p. 176). That is a good call, but the layout of the room is small and different.
Perhaps this was a minyan in the front room of the hall…if there was a front room back then.