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.
Just to be sure, are you using the same version you originally created the world in? Otherwise, did you ever have to fix the world because level.dat was corrupted (specifically, by creating a new world with the same name, which will reuse the existing chunk data but the seed will change unless you re-enter it).
Also, it is impossible to recreate a world based on the system time since Java hasn't used the system time to seed its RNG since Java 5, released long before Minecraft existed and the oldest version of Java that any version of the game can run on; the best that could be done is a brute-force search using structure locations, which is actually more practical than you might think (GPU computing can do it in a few hours on a modern GPU), but unfortunately there weren't any structrues in Beta 1.7.2 and slime chunks depend on the current world seed.
You can try watch actual seed with NBT Editor - open level.dat with it and search for seed value.This will be your original seed. You can try to make new world in beta 1.7.3 and compare to your original one. If it will be different, than as TheMasterCaver say - only brute force can help you
I tried with Chunkbase that it say supports 1.7 but also comes out something different. Are you sure you didn't mispasted the seed?
Release 1.7 and Beta 1.7 are very, very different versions; based off of what ChunkBase lists it refers to Release 1.7 and it doesn't even list older versions like 1.6, which would definitely be included if it went as far back as Beta 1.7 (world generation changed in (at least) Beta 1.8-Release 1.1 and Release 1.2-1.6.4, so there should be at least 3 more options if it went back that far):
I tried searching for tools that would create a biome map of a Beta 1.7.3 world but I couldn't seem to find anything other than tools that require an existing world (like the OP) and the other main AMIDST-like tool that I know of, MineAtlas, only appears to support 1.8.
It would be possible for somebody to extract the biome generator from Beta 1.7.3 but there likely isn't much demand or such tools only exist for private use or aren't readily available/known online (I've made my own biome mapping tools for vanilla 1.6.4 and my own mods by directly taking the classes out of the game with little modifications required to reduce my dependence on 3rd-party tools, aka AMIDST, that can break at any time (if they work properly at all in the case of modded versions) so it wouldn't be that difficult to do the same for Beta if the biome generator has a similar structure, not directly depending on other Minecraft code).
I created worlds using "6059188669970044928" in both Beta 1.7.3 and Beta 1.8.1 and two distinctly different worlds were produced which indicates that the world generator was changed between the two releases.
That explains why recreating deleted chunks caused different terrain to be created.
It's likely that the OP used a version prior to Beta 1.7.2 to create the original world.
I would suggest trying that seed with other versions
Here are the release dates of versions that year.
Version Release date
Beta 1.7.3 July 8, 2011
Beta 1.7.2 July 1, 2011
Beta 1.7_01 June 30, 2011
Beta 1.7 June 30, 2011
Version Release date
Beta 1.6.6 May 31, 2011
Beta 1.6.5 May 28, 2011
Beta 1.6.4 May 26, 2011
Beta 1.6.3 May 26, 2011
Beta 1.6.2 May 26, 2011
Beta 1.6.1 May 26, 2011
Beta 1.6 May 26, 2011
Versions shown in bold are available to download in the MC Java Launcher.
EDIT: I just tried to create a world in Beta 1.6.5 and there is no option to enter a seed.
Beta 1.6.6 appears to be the first version that has the seed input option.
I can't tell if "6059188669970044928" used in Beta 1.6.6 creates the world the OP is hoping for.
Version Beta 1.7 creates a different world when using "6059188669970044928" than Beta 1.6.6 does.
I suggest the OP create profiles for each of the versions from B 1.6.6 thru B 1.7.3 and try each one with that seed.