This rifle is likely one of many greek returns sold by CMPicon . They are generally great shooter rifles, ranging from fair to excellent for original parts. Without detailed pictures value should range from $600-$800.
I believe bore condition to be the greatest factor in these rifles. A good quick test of the muzzle wear without gauges is to insert the tip of an M2 bullet in muzzle to see if at least 1/2 of bullet stands proud of the muzzle. Also a look with a bore light once grease is removed.
You are far apart on value with the seller. Original parts and stock would bring the value close to his asking price. Some untouched Greeks did happen, but not many. Detailed pics without grease are needed.
A good site to check serials and part comparisons is here: http://www.vishooter.net/m1903.html
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