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Why do some ID discs not have an acceptance mark?

Disc from 1916 Simson
Only one side is accepted..

To your question - a few reasons:

- The acceptance was apparently omitted on some later rifles.

- They were sometimes flipped when the unit mark was no longer meaningful. Or a new disc was later installed and put in upside down. Pretty low likelihood of this on a wartime gun though.

-Sometimes the manufacturer installed them upside down inadvertently.
 
Only one side is accepted..

To your question - a few reasons:

- The acceptance was apparently omitted on some later rifles.

- They were sometimes flipped when the unit mark was no longer meaningful. Or a new disc was later installed and put in upside down. Pretty low likelihood of this on a wartime gun though.

-Sometimes the manufacturer installed them upside down inadvertently.
Thanks Chris. Could the same be said about sling swivel bases?
 
Chris can disagree with me, and I’ll be happy for it, but my opinion is that not all parts were acceptance marked to begin with. A random guess this morning would be a low end of 10% with a high of maybe 30% weren’t inspected coming out of the factories.

Non essential parts like the sling swivel are much higher.
 
Chris can disagree with me, and I’ll be happy for it, but my opinion is that not all parts were acceptance marked to begin with. A random guess this morning would be a low end of 10% with a high of maybe 30% weren’t inspected coming out of the factories.

Non essential parts like the sling swivel are much higher.

Do we know if armorer parts were marked, or less likely to be marked? I could see non-essential small parts in particular skipping that, especially once you get into wartime needs.
 
* I misinterpreted Nathaniel’s statement, but here’s my slightly tangential response:

Bayonet lug pins, rear sight leave pins, trigger sear pins, floorplate release button pins in triggerguards, recoil lug nuts, stock disk screws, and buttplate screws come to mind. (And the pins likely could not be stamped without ruining their shape.) Wartime the acceptance drops from ejector box components, sling swivels, magazine springs, locking screws, and sight slider tabs typically, but this varies by maker. Amberg for example drops very few acceptance, while Danzig drops a lot. We need more photos and date sheets to tell which maker drops acceptance on which parts.

Here is DWM 1909 3366a, as you can see every small part is marked. Compare this to Sams recently acquired DWM 1917, you’ll notice that acceptance is dropped on trigger, locking screws, et c.
 
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Do we know if armorer parts were marked, or less likely to be marked? I could see non-essential small parts in particular skipping that, especially once you get into wartime needs.
Armorers parts were usually very well accepted, here are some examples:
 
Chris can disagree with me, and I’ll be happy for it, but my opinion is that not all parts were acceptance marked to begin with. A random guess this morning would be a low end of 10% with a high of maybe 30% weren’t inspected coming out of the factories.

Non essential parts like the sling swivel are much higher.
I think there's really two separate things for discussion:

1) Were all parts really inspected? No. The presence of an inspection stamp does not mean the part was actually looked at. The regulations pretty explicitly stated that no fewer than 10% of parts were to be actually inspected. This means there was some latitude there given to the inspectors; it may have varied, but there's no real way to know, as everything was stamped regardless. I would imagine that the percentage hovered a lot closer to 10% later when some of the manufacturers hit production highs. It stands to reason the number crept higher in earlier days. There's some discussion of the "were they actually inspected?" topic on page 133 of Storz.

2) Would all parts have an inspection stamp? As always, it depends--Cyrus did a great job of explaining that things progressively changed and manufacturers omitted certain things as the war went on. I think it generally depends on the manufacturer and when it was made. Pre-war rifles should be pretty consistently marked everywhere indicated in the regulations.
 

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