Here is an oil painting for sale on Ebay of ballroom dancing scene of early 1900. ( I don't own this painting, BTW

and I am not related to the seller ).
Please take a look on the ebay.com item # 424633579,( go to ebay and type in search for item # ) where the men's right hand were holding ladies left hand while placing their left hand behind the ladies' back. I wonder if the oil painting was done wrong or did they danced that way in those days? I had tried to put the link here but unable to do so.
Regards,
Keh Gough