Consew Model 28 - Copy of Singer 78-3 - Made by Seiko of Japan?

[boatmaninc]

Recently, I was given this sewing machine.  From what I have been able to figure out (not much) is that it's a Consew Model 28 made by Seiko as well as a copy of the Singer 78-3.

It's on a Singer Table which appears to be in great shape.  I'd like to figure out more.  Age?  

It's the dark olive matte green finish with a black line above the black base.

I'd like to restore and use.  Any oil recommendations beyond the premium sewing machine oil?  Anything need grease? 

Any idea of the age?  I've scoured Google using "Consew Model 28" and only really 2-3 pictures appear in this vintage.  Who do I contact at Consew regarding the serial number?

Any tips on restoring table?  It's age?  What is the best think to do to the table top.  Any instructions that come with this table?  Large factory pin holes found in 4-5 locations on top.  Motor maintenance?

Can anyone identify the walking foot on this machine?

Finally, can anyone explain the weird letter arrangement on this machine?  Appears to be two different similar styles of letters.

Appreciate any advice, tips and even some criticism.  

Noah

Consew 28 Operating Instructions.pdf