I have a Philip Hammig silver alto flute. I bought it when I was living in Uzbekistan from a Russian. When I bought it he told me that the fingering of the G is different from the normal C flute. I have not played for sometime as I have developed arthritis in my fingers. I have someone who wants to use it, but I cannot tell them how to finger the G and I cannot try it myself as some fingers do not bend anymore.
Thanks for any help with this!!!

See http://www.wfg.woodwind.org/flute/ofl_bas_1.html for a fingering chart for C flute/piccolo with open G#. Of course, the alto flute is in G so you'll need to transpose.