|Keyswitches||Cherry MX Pale Blue?|
|Dimensions||480 × 204 × 36 mm|
K-457 is a keyboard from Copam.
In the example below, the controller is dated to 1991, as is the PCB (both 91 in the Gregorian calendar and 80 in the Minguo calendar). The switches are uncertain — they have the same apparent spring characteristics as found in Cherry MX Pale Blue, as well as the same yellow discolouration of the slider ramps; however, the shade of blue seems to be perfectly in keeping for regular Cherry MX Blue, while Pale Blue is a different hue. alps.tw describes the K-457 switches as being "藍" ("blue") and regular Cherry MX Blue as being "青" ("green"). The actuation force of the switches is 52–56 g according to alps.tw, in line with Cherry MX Blue.
- KBtalKing — ■鍵盤史的遺跡Copam+ K-457( Cherry MX藍軸)■