Lovely! The mop adds a charming touch to this nice machine!
Does it have a needle installed? If so, remove it carefully, noting the orientation of the long groove and flat side, if there is a flat side. There might not be a stop when the needle is in the correct position. Before removing it, a permanent marker can be used to mark the needle (on front at the point to which it is inserted) to aid getting it back in correctly. This machine might use a 12x1 round shaft needle. Many (but not all) of the transverse machines use this needle.
Dianne in Colorado