"Read where said" is precious little to base a purchase on, further the context of what was said and the rifle in question can have miles between them... this rifle has been at auction for quite some time, as I recall the price was excessive and the pictures weren't encouraging, neither in number or quality, they did not show the rifle adequately nor how bad the corrosion is, but clearly between the description and the poor pictures it is a serious issue.
As for my comments, this rifle clearly contradict the observation that only 10,000 were made, this is a 4000/a block, which means more than 14,000 were serialed (final accepted probably less), but since then, apparently, more have been discovered, the current estimate for Danzig/07 is 6433/a which means roughly 16,000 rifles were made during this year. This is further complicated by the observation of a confirmed c-block Danzig/07 though no rifles between 6433/a and this c-block, so the c-block is not sustained as the current high because the general rule (for two decades or more, a rule Mark Weiringa outlined three decades ago) is that current highs should be supported by rifles near by, that huge gaps should be viewed with suspicion until rifles appear to support them, - a rifle that would more than double a confirmed high that is not supported should be held until it is supported by other rifles or new facts. Further we know with certainty that earlier receivers have been known to show up in subsequent years production, usually with a "/date" but not always. This newly recorded c-block does have the right acceptance pattern for a Danzig/07 so it is possible it takes Danzig to more than 30,000 in 1907. We must always be aware that survival rates among pre-war makers are far lower than wartime, it is not uncommon to discover new highs among all the pre-war makers because the vast majority were destroyed during and after the war.
Anyway, regardless of these observations, any Danzig 1907-1908 is very elusive and 1909-1913 extremely rare, in real terms they probably weren't produced these years, being as Danzig was making the Kar.98a in small numbers. There are a couple G98 receivers dated these years, but they all suggest they were made later, our UK friend here owning 1912/15 Danzig 2848 b, which can be found on this forum. There is a similar 1909 recorded by Jeff Noll, though a report only and it could be a Kar.98a misreported. There are no solid recordings 1909-1913 for Danzig, though the existence of the 1912 receiver suggests the possibility more exist. Generally, the arsenals stopped or seriously restricted G98 production just before and during Kar.98a production, in Danzig's case 1907-1908 were very low G98 production years, 1909-1913 they seemed to have stopped G98 production, and in 1914 they took G98 production back up (strongly).
As for the bolt, it is probably closed due to dried grease, a penetrating oil probably would help over time, though a bolt can be frozen due to rust and pitting too. I use to own a Danzig/09 kar.98a, just a beautiful carbine, but the chamber was pitted from rust and abuse, when fired it locked up the bolt and it took some effort to loosen it, though it improved over time. I am not a gunsmith so can't offer much advise here.. there are several other possibilities to the reason why, first thing to do, it seems to me, is to disassemble the rifle and see the action out of the stock. As for the exposed metal, that is a problematic issue, I doubt two collectors agree on what is best, - beyond starting slow and working into the least intrusive method. There are several methods that I have read used before, though I have never bought a rifle with this much work involved, - the first step would be to take it out of the stock and get good pictures of it, then we can discuss/argue over how best to proceed, the real problem is the blued parts, the barrel you shouldn't use steel wool on, even bronze can be a problem. For bright metal (receiver-bolt) 0000-steel wool is fine, though excess should be avoided. Hopefully it looks better in hand than the auction pictures (which is often the case).
Re-unit markings, it is possible, there are several 1906-1907 with unit markings.
I won it he said it is all matching but you know how that goes. He said the bolt is frozen up should I shoot wd -40 on it and what should I do with all the rust on it. I hope it has unit marks on it I will take picture when I get it. I read were loewe said there was only 10,000 made so I jumped on it
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