Brand new production (Late 2021) KSC1815YTA NPN transistors by On Semiconductors. 10 pcs per lot. 
The original Toshiba 2SC1815 was the most widely used transistor in the world back in its day.

Suitable sub for:
2SC458 (Exact replacement)
2SC281 (UNLESS METAL CASE ATTACHED TO HEATSINK)
2SC634*
2SC634A*
2SC900
2SC923
2SC1313 (Better than KSC1845) 
2SC1328
2SC1364
2SC1570
2SC1685
2SC1815 
2SC2603
* SEE COMPARISON SPECS IN LAST PHOTO

Lower VceSAT voltage makes KSC1815 better for low voltage applications, switching, current limiters and some preamp circuits.

Complimentary transistor (PNP) is KSA1015YTA which we also have listed for sale

SEE LAST PHOTO FOR SPEC COMPARISON.
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Material of Transistor: Si
Polarity: NPN
Maximum Collector Power Dissipation (Pc): 0.4 W
Maximum Collector-Base Voltage |Vcb|: 60 V
Maximum Collector-Emitter Voltage |Vce|: 50 V
Maximum Emitter-Base Voltage |Veb|: 5 V
Maximum Collector Current |Ic max|: 0.15 A
Max. Operating Junction Temperature (Tj): 125 °C
Transition Frequency (ft): 80 MHz
Collector Capacitance (Cc): 2 pF
Forward Current Transfer Ratio (hFE), MIN: 70
Package: TO-92