Finding a replacement for "Schwalbe No.19 40/62-584/635" tube
40/62-584/635


Means the tube will fit ETRTO 584 to 635 rims, and 40 to 62mm wide tires. 

Inner tubes don't have an exact ETRTO code because they fit a range of rim diameters and tire widths. Tubes from different manufacturers (and single manufacturers at different times) will have different ranges, so buying an exact replacement model can be difficult.

As ojs said, find the ETRTO size of the tire then buy a tube that accommodates that size in its acceptable range.