IBM 50 Key Keyboard

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Model M 50-keys

Part number	1395249 (printed keycaps) 1392554, 1392560 and probably others (relegendable keycaps)
Branding	IBM
Manufacturer	IBM
Layouts	50-key with specialized Keycap labels
Keyswitches	Buckling spring over membrane
Interface	PS/2
Years of production	1990

The IBM Model M 50-keys is a sub-tenkeyless matrix-layout buckling spring keyboard. Judging from the specialized keycap labels it might have been used as a cashiers keyboard or similar.

A variant exists that uses relegendable keycaps instead.<ref>Deskthority — IBM 1392554</ref><ref>Deskthority — An IBM M keypad that feels like an F.</ref>

The M50 internal assembly is heavy, while the plastic clips that keep the assembly centered are very thin. The plastic clips can get damaged in shipping, even if the keyboard is well packed, if the package gets a lateral shock (for example if it gets dropped on its side). If buying an M50 it's recommended to ask the seller to disassemble the keyboard, and separately bubble-wrap the assembly and the case.<ref>Model M discord — https://discord.com/channels/750564174173700116/750574433638547527/800934951855849532</ref>

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  Closeup, keys
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  Bottom case with sticker
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  Closeup sticker, bottom case
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  Side view
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  Without upper case
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  Metal plate with sticker
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  2-Piece keycap and switch spring
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  Rear view

References

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