Decades ago I found those 7,62 x 39 brass head, no headstamp, nickel plated boxer primer blanks. About the origin I was told they were Geco experiments.
Taking a closer look I found they do look alike, while they are not! The picture shows from the left
• for illustration the head of a 7,62 x 51 black plastic blank, headstamp DAG * 12-58
• a 53,8 mm long, 7,29 gram
• a 55,6 mm long, 7,54g gram, and
• a 53,5 mm long, 6,69 gram.
The x-ray shows that both on the left share the same style head, just like the head on the very left, so we can assume they originate from about the same period as the pictured Nato head piece ***.
Is there any better information than hear-say-“by Geco” out, what more is known? Do they belong to the NWM 7,62x38 context?
Thank you, Hans
Edit: *** while the head piece of the right internally looks completely different. Unfortunately I have no other 7,62 x 51 blank specimen to compare