Pastel Portrait of a Young Man

This very skillfully drawn pastel on paper is signed at the lower right, but unfortunately we have not been able to read the signature or the date with confidence. It is in excellent condition, probably having been kept in an album for most of its existence.  The image itself measures about 6.5 x 6

probably England 1860's? c.H: 11.75"W: 9"Reference number: 28525