This does not appear to be a serial number. Please describe where on the rifle you noticed this - i.e. on the left side of the receiver wall, on the left side butt socket?
Was it exactly as you typed it - all in a line or was it stacked as in
1944
1017*
80
Is the "*" an actual "*" or is it to represent a number?
Check this web page I put together http://home.earthlink.net/~smithkaia...ists/id17.html
Look at the entry for texasjack - is it possible the 80 was a "BO" and was stamped above the 1017*
If that was the case you have a No.4 mark 1 made at Maltby in 1944