What is this? (Model M)

[lowpoly]

I got two Model Ms through ebay, from different sellers.

Both are missing the label on the back but there's one inside on the metal plate. Both are german layout.

First is a blue label, controller chip says Lexmark. The label on the metal plate seems to be the std label and it says

1386716  
ec 528771
1993-01-15
manufactured in united kingdom

The other one is a silver label like this one:

http://www.clickykeyboards.com/index.cfm/fa/items.main/parentcat/9230/subcatid/0/id/130591

It has the yellow cables but is missing the 5th screw that is mentioned in the clickykeyboards description.

There are two stickers on the metal plate, first one is the std one and it says

1386716
ec 528557
30-10-1986
manufactured in united kingdom

Second one looks non-std, just printed, saying

part no 1390343
ec no 528553
vendor no 6301
model g
serial no 593861584

I just mentioned the blue label because the part no seems to be the same which doesn't make sense?

Why does the second one have two part numbers and why does it say model g?

(Apologies for no pictures).

[lowpoly]

Found another, newer board through google that has the 1386716 as EC number so this is no part number. Maybe it's the layout.

I didn't find anything on the 1390343 part number.