First thing I need is a space bar.
The other part is to replace the broken part shown in circle. 
I will gladly par a fair price. 
Thank You





 

I found a local restorer that has a space bar. I actually got it at a thrift store.

In regards to taking it apart. 
It would only be to clean the inner workings.

I have owned a lot of vintage items. IE: Civil War Colts, Typewriters, Machinery, Clocks etc.. And can tell if something has been apart before. I am 100% sure this typewriter has not been restored or repainted. This is a 30's Black Matte Crinkle Paint. Exactly like would have been found on a Remington Noiseless Portable. 

The other reason I think its all original is the Chrome matches everywhere and no pitting, rust, wear, or voids. The unit when I got it was virtually covered in a film similar to cosmoline. The keys could hardly be read. You could not even see the numbers on the Tabulator Keys. It could have been years of dust. Whatever the film was it sure protected the paint. The clear number grid shows no signs of wear and almost every screw shows no signs of removal. 

I just acquired this really nice Underwood Tabulator Model No 6. It needs a new space bar. Paint is 99% perfect with only the slightest wear and missing. Even the side screws have the paint. Leading me to believe that they have never been touched with a screwdriver. That black crinkle paint is pretty fragile on screws. Serial number 4069509 dates it to 1931. 
I have started cleaning it up but it works very well. Tabulator feature which I have not seen before is a nice feature.

How rare is this typewriter?
Should I take it apart or leave it in as is condition?
Have you ever seen chrome feet on an Underwood of this era?
Were there different levels of Model 6's?
Any guess no the value?

As always thanks in advance for any information.

https://www.ebay.com/itm/1938-Rheinmetall-Portable-Typewriter-Highest-Collector-Museum-Grade-RARE-MINT/143128930586