Se Jin M-8700

Se Jin M-8700
Switch	Futaba MA
Sense method	Metal contact Conductive membrane assembly
Protocol	AT / XT
Keycaps	Double-Shot ABS Dye-sub PBT

The Se jin M-8700 was a series of AT layout keyboards manufactured by Se jin Electron and OEM'd for various computer manufacturers and brands.

The M-8700 could come with ABS doubleshot or dye-sub PBT keycaps and Futaba MA Inverse cross mount clicky switches or a currently undocumented Futaba mount membrane switch¹⁾.

There are multiple variants of the M-8700 which include:
'M7USxxx-xx' The US English variant of the M-8700.
Currently documented to have come with Futaba MA and ABS doubleshot keycaps.
Brands documented to have used this model include Vendex Headstart²⁾, VTI,³⁾ Apex by Epson,⁴⁾ Samsung⁵⁾ and Packard Bell.
Despite having the cutout for a lock-light switch no US model is currently documented to have used one and are instead left locked into a single protocol.

'M7Kxxxx-xx' The Hangul variant of the M-8700.
Currently documented to have come with Futaba MA and a currently undocumented membrane switch.
This version has been documented to come with ABS doubleshot or dye-sub PBT keycaps.
Brands documented to have used this model include currently Samsung⁶⁾ and Daewoo⁷⁾.

'M7US0SX-37' A unique Vendex Headstart branded version of the M-8700 with a completely different case design and auto AT/XT functionality.
Documented to come with Futaba MA and thick doubleshot ABS keycaps. ⁸⁾

'Headstart Explorer' A M-8700 assembly integrated directly into the Headstart Explorer computer. ⁹⁾
Currently not much is documented about this variant outside of the fact the documented versions use the membrane switch.

The M-8700 has been documented to come in three different kinds of cases:

A generic version used in most rebrands and all unbranded models: The top is made of ABS plastic
Externally, it has a pen holder above the top key row and a lock-light sticker on it's top right. On rebranded models it features a badge cutout in the top left.
Internally, it has date of manufacture time stamps and plastic standoffs for fastening the bottom case into the top case.

The bottom is made of ABS plastic
Externally, it has a cutout for a AT/XT switch (unused on all documented models), the keyboard sticker documenting the keyboard's FCC ID, country of origin, model number and serial number and four total feet: two non-slip feet and two flip out feet with two settings each, one which sets the keyboard at a 11° angle and the other at a 15° degree.
Internally, it has 4 pegs for holding the assembly in place, a metal RF shield and two rubber pads for preventing the assembly from shorting on the RF shield.

The assembly on the Futaba version consists of a PCB and switch steel plate.
The PCB has a sticker which shows the assembly model and serial numbers.

The top A 'M7US0SX-37' version produced for Vendex Headstart:
The top case is made of ABS plastic
Externally, it features a sloped design near it's top which has the Vendex Headstart logo in it's top left corner and a distinctive lock-light sticker with a slant on it's left side.

The bottom case is made of ABS plastic
Externally, it has six screws for fastening the two case pieces together and uses four feet in total: two non-slip feet and two flip-out feet which use the same design as the M-8700 on a large protrusion on the back of the case. It has two stickers on the back: a auto AT/XT sticker and the model sticker with the keyboard's FCC ID, country of origin, model number and serial number documented on the back. As of writing there are no internal pictures documented; however based on the pictures it appears to use a painted steel plate.

A 'Headstart Explorer' version used in the Vendex Headstart Explorer computer. The top case is made of ABS plastic
Externally, it has three screws one at the top and one on each respective side for fastening the top into the bottom, lock-lights cutouts with lettering embossed directly into the case and two large plastic hinges for flipping the keyboard up to the top of the computer case when not in use.

The bottom is made of ABS plastic
Externally, it only features a 'Headstart Explorer' logo printed on it's bottom left corner.

As of writing there are no documented internal pictures of the case.
There is only one picture of the assembly; it shows a steel switch plate, mainboard with membrane connects and a cable for internally connecting the keyboard to the computer.

All versions of the M-8700 use OEM profiile, Futaba inverse cross mount keycaps in either ABS doubleshot or dye-sub PBT.

Detailed pictures are from a model identical to the one doomsday_device pictured. The solder and flux is not original as the old switches were swapped with NOS ones.

Pretty pictures provided by @doomsday_device from the KBI discord.