1940 660 with Geco Barrel HELP!

New user here, in fact new owner as well. I just inherited a K98k from my great grandfather through my dad. I am brand spanking new to these rifles and I must admit I'm super excited.

Here's where I'm at so far and any help would be truly appreciated.

1. This is a 1940 660 I'm pretty sure, but this was sportsterized and whomever did the work in the late 50's? Tapped right through the middle number.
2. This has a Geco Barrel, but does not appear to be rework due to the 4th wa623 covering both barrel and receiver.
3. The butt plate DOES have a dwc mark which may indicate rework????

Please let me know what you think, or where to check the gun for additional info.

Pics to follow
 
More pics
 

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Also, only bolt markings I can find, from what I can tell the serial numbers partial as they are don't seem to line up, but what are these proof marks????PXL_20250325_185719764~3.jpg
 
The receiver is from the Steyr factory in Austria. I would need to see a picture of the full barrel code to make any guess on that as I'm not sure that Geco was a barrel supplier for Steyr. The 4th WaA623 stamp is actually still on the receiver. The bolt is from an imperial Mauser 98 so definitely not from a K98k. The stock is not original either as it is mid-late war.
 
@ bda, Thank you for all of the information so far! PXL_20250325_143632248~4.jpgPXL_20250325_142548426~2.jpgPXL_20250325_154212785.MP~4.jpgPXL_20250325_164954297~3.jpgPXL_20250325_164954297~4.jpgI'll try to get some more pics when I get a chance. I will zoom in and show you what I've got with the pictures I currently have. I do know that it has the geco logo and large block letter 459, followed by a smaller block lettered 39, a large Ru then the proof marks on the top of the barrel. The barrel. The serial number matches but the letter style is different on the two numbers between the receiver and the barrel.
 
As for the bolt, the only other identifying Mark I was able to capture on it is the following, that would make sense that it is not an era bolt due to the lack of the eagles. Would you happen to know what the blow Mark is?PXL_20250325_191119717~2.jpg
 
It was period rebarreled… evidence by the 0,2 on the barrel’s collar, and obvious different firing proof. Too bad for the Bubba
 
I guess that I mistook the commercial proofs for older imperial proofs. Not really and area that I know much about. That's why I'm learning things everyday.
 
I thank you all for your time! What an interesting and eclectic piece of history this is, topped off with the work done mid-century in America and the vintage Weaver scope, rings and mounts, I'll get this thing to the range with some hand loads and see if it's a shooter. If it is, may get a new quality hunting stock on it and continue to be a family heirloom.

One more question, do you happen to know if geco made quality barrels? I looked them up. Looks like they've been a long-time producer of Mid-Level hunting gear in Germany for quite some time. Wondering about the quality during their war years. Inspection of the barrel looks like grooves still look quite good. PXL_20250325_135750289.MP~2.jpg
 
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