I found some photos of a 1902 Wagner made Underwood No.4.   Note that the No.4 different from the No.5 in having 4 less keys; otherwise they are the same.  The No.4 was continued in smaller numbers in later years and at least into the teens.  In comparing Wagner made Underwood Nos. 4 and 5 from later models there are quite a few small detail differences but one has to know what to look for or have an example of Wagner and Underwood made machines together for comparison.

http://cambridgetypewriter.blogspot.com/2014/11/underwood-no4-repair-and-more.html

None of those are Wagner made typewriters from a quick look.   A Wagner Underwood will not have the "UT" decal on the paper table to the left of UNDERWOOD.  Of course that could have been changed.  The left side ribbon winder was continued for some years, up to about 1908.  I have photos of a 1903 Wagner made No.4 but, also, a 1903 Underwood made No.4 and assume that change from Wagner made to Underwood made occurred in 1904.  Below are some notes I have made based mostly on eBay Underwoods for which I could get the serial number to date the machines.   I don't see a way to add un-hosted photos to this forum which is too bad as I have some good photos I could add.Underwood details: 11287-4 1902, No.4, Wagner made machine, Peter Weil's12435-4 1902, No.4, Wagner made machine,  mine25070-5  1903, No.5, Wagner made30255-4 1903, No.4, margin release button appears on left front of machine. Have photos103879  1906  No.4,126410  1906  No.4, last patent date Jan 20, 1903, also has left side ribbon winding wheel151931-4  April 1907, has left side ribbon winding wheel.212128-4 1908-early 09, no left side ribbon winding wheel.234172   late 1908 or early 1909,  (mine), no ribbon selector or back space key255655  1909, No.4, Back Space key, no ribbon selector, May 14, 1907 last pat. date on rear276393  1909  has ribbon selector rocker key, May 14, 1907 last patent date, back space key286982  1909-10,  has ribbon selector rocker key354045  1910,  has back spacer key and ribbon rocker key.480056  1912  has back space key, ribbon selector, old shift lock lever, no variable line space620426  1914,  old style shift lock lever, no variable line space push button on left end of platen knob.800390 c.1915-16,  (Richard's) Has shift lock key and variable line space push button and back                                    space key.  Last pat. date July 1, 1913883716 c.1916,  has backspace key, Jan 12, 1915 last pat.982944 c.1917,   has varia

Let's resurrect this thread.   Last year a friend notified me that he had found a cover and base for a Monarch and, knowing that I had the No.2 shown in this thread, he offered the cover to me.  I love to have the metal covers for the old standard typewriters but they are not always easy to find.   I noted that the decal on the front of the case has an image of a No.1 Monarch but was wondering if that decal was used on the No.2 machines also.

I bought a rusty old 1904 Remington No.6 at the flea market Sunday for $20.  I needed a shoulder screw and the small coiled spring at the pivot point of the line advance lever (carriage return).  Considering that the typewriter (parts) were right there I felt ok about buying a junker.  I also needed the paper shelf but it had poor paint.

I found out later that night that I made a very good buy because I soon became aware that it was a machine that I was not hesitant to work on and to try to see how things worked.  Many of the typebars were very stiff so some drops of Liquid Wrench got them moving, all but the "O" which had it's wooden lever under the tyepwriter disengaged from the rear where it fits over a part of the frame.  

I figured out how to locate it properly then turned my attention to another letter which was not operating.  The rod that hooks to the typebar pivot had come loose and I was quickly able to see how it went back together.

So, a junker for not too much money ($20 but still a hunk of change for a "useless" typewriter) was, for me, a very good deal.  And I can work on it some more and will have to to get that pesky shoulder screw loose.

The carrage was not moving either when I got it.  Rusted in place but soon I got that moving pretty well.   When I say junker it's not too bad to restore but I doubt that anyone would ever take on the task on a relatively common machine.  I have three others; 1894 and two 1907s.

Two other new typewriters:  A very nice working Smith Premier No.10 and a clean Underwood No.5 (1923 I think) with a unique metal and felt soundproof box that the typewriter sits into.  You may have seen it on ebay in March.

Uwe wrote:

Steve, could you post a few detailed photos of these nuts? I have a pretty good idea from your description how they function and I still think that a substitute of some kind would be readily available.

I'd happily post photos but how?  Photobucket ruined my album when they switched to the new format so I don't have a usable photo host.  Is there another way?  I really wish photos could be posted here directly.