The BC177 is a TO-18 metal-cased silicon planar epitaxial PNP transistor. It can be found in television receivers' driver stages, low-noise input stages, and signal processing circuits. The VCE of this transistor is -50V, and the continuous collector current is -100mA. It can be used as a signal switching transistor for small signals. It has a -5V base voltage as well.
More details:https://www.utmel.com/components/bc177-low-power-pnp-transistor-datasheet-pdf-pinout-and-equivalents?id=931