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 variable line space push button 1016789 c.1917,  old style frame, has back space key, Aug. 17, 1915 last pat.1162658 c.1919,  old style frame1521644 c. 1921, old style frame, May 8, 1917 last patent1576461 c.1922,  old style frame1626815-5 1922, new style frame, last patent May 8, 19171629817-5 1922, new style frame with worm carriage spring (ned brook's)1726351-5 1923, new style frame, mine with soundproof box.1994610 c.1925,  new style frame, has back space key, last pat. Aug, 14, 19233709066-5 c.1930,  top mounted ribbon selector switch 

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.

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