I created my first world on 25-27 July 2011 on Minecraft Beta 1.7.2 (generation the same as in Beta 1.7.3). Seed of map that I get from level.dat and in all programs (WorldPainter, MCEdit, Minecraft Beta 1.8 [F3 debug mode], etc.) is 6059188669970044928. But when I trying to recreate my world with it's original terrain, I always get completely other world generated. Also I remember that many years ago I was deleted many chunks from my map and they are was regenerated in game, they (chunks) was like from other map. So I guess the seed of my first world is broken.
How I can get original seed of my map and recreate my first map?
I have idea to generate a lot of maps depending on system time for period on evening for July 25-27, 2011 and compare some regions blocks... But it will need to generate millions of maps to get equal to my.
I also tried to generate my world on my laptop where my world was originally created (and with Java 6), but it not helped and there are no differs between world with the same seed created on my current laptop.