The image was probably sepia printed in the first place
http://www.ephotozine.com/techniques....cfm?recid=105
A sepia toned print not only gives a pleasant tonal range, it also has a longer archival lifetime than an untreated print, because silver sulphide is more stable than pure silver.
Your scanned image is 333*458 pixels. Thats not very big. Have you shrunk it to get it to upload to Cable Forum? What size is the original photograph?
Images on screen look far bigger than they do when printed at high quality. This image is about 1in bu 1.5in printed.