Dimension of number-stamps

[Edward Tinker]

Well, I would disagree; from our book Simson Lugers; which came from the 1910 governmental requirements that Erfurt followed:

PISTOL 08 Markings (1910):
Instruction on Marking the Pistol 08, with an Attached Drawing. Berlin 1910.
(Vorschrift für die Stempelung der Pistole 08 nebst einer Zeichmung. Berlin 1910).
With all amendments up to and including 1914.
(Source: Bayerisches Hauptstaatsarchiv, Abteilung IV Kriegsarchiv, Munchen, File AS. V. 73/13).
1. Barrel, finished: 3.2mm-high inspector's mark.
2. Front sight, milled: 2mm-high inspector's mark
3. Receiver, hardened: 3.2mm inspector's mark, plus the year of manufacture (3.2mm high, 9mm wide)
4. Ejector, hardened: 2mm-high inspector's mark
5. Sear bar, hardened: 2mm inspector's mark
6. Breechblock, hardened: 3.2mm inspector's mark
7. Extractor, hardened: 2mm inspector's mark, plus "Geladen" on the left side
8. Firing pin, hardened: 2mm inspector's mark
9. Firing-pin spring retainer, hardened: 2mm inspector's mark
10.Front link, hardened: 3.2mm inspector's mark, plus the name of the manufacturer (size not specified)
11. Rear link, hardened: 3.2mm inspector's mark
12.Coupling link, hardened: 2mm inspector's mark
13.Recoil lever, hardened: 2mm inspector's mark
14.Recoil-spring bar, hardened: 2mm inspector's mark
15.Frame, hardened: 3.2mm inspector's mark, plus "Gesichert" on the left side
15a. Hold-open latch: 2mm inspector's mark
16.Locking bolt, hardened: 2mm inspector's mark
17.Trigger, hardened: 2mm inspector's mark
18.Trigger lever, hardened: 2mm inspector's mark
19.Side plate milled: 3.2mm inspector's mark
20.Magazine latch, hardened: 2mm inspector's mark
21. Magazine, finished: 3.2mm inspector's mark
21a. Magazine fitted: 2.1mm inspector's mark
21b. Magazine, bottom piece: 3.2mm inspector's mark
22.Safety-bar, hardened: 2mm inspector's mark
23.Safety lever, hardened: 2mm inspector's mark
24.Grips, finished: 4.2mm inspector's mark
25.Grip screws, hardened: 2.0mm inspector's mark

PISTOL FINISHED AS FOLLOWS:
26a Pistol ready for power-proof and shooting-in:
·Barrel: full pistol number in 2.1mm-high numerals.
·Receiver: 3.2mm-high inspector's mark, plus the full pistol number in 2.1mm-high numerals.
·Breechblock: last two digits of the pistol number in 2.1mm-high numerals.
·Extractor: last two digits of the pistol number in l.5mm-high numerals.
·Firing pin: last two digits of the pistol number in 1.5mm-high numerals.
·Front link: last two digits of the pistol number in 2.1mm-high numerals.
·Rear link: last two digits of the pistol number in 2.1mm-high numerals.
·Hold-open latch: last two digits of the pistol number in 1.5mm-high numerals.
·Trigger: last two digits of the pistol number in 2.1mm-high numerals.
·Side plate: last two digits of the pistol number in 2.1mm-high numerals.
·Trigger lever: last two digits of the pistol number in 1.5mm-high numerals (Simsons are not numbered).
·Safety-bar: last two digits of the pistol number in 1.5mm-high numerals.
·Safety lever: last two digits of the pistol number in 1.5mm-high numerals.
·Grips: last two digits of the pistol number in 2.1mm-high numerals (Simsons have full serial number).
·Barrel and front sight: alter sight adjustment, a chisel mark, 3 to 4mm high, of equal length on both parts.
·Barrel and receiver: alter sight adjustment, a chisel mark, 3 to 4mm high, of equal length on both parts.
26b Pistol after power proofing:
·Barrel: a heraldic eagle, 3.2mm high and 2.9mm wide.
·Receiver: a heraldic eagle, 3.2.mm high and 2.9mm wide.
·Breech block: a heraldic eagle, 3.2mm high and 2.9mm wide.

26c Pistol after shooting-in:
·Receiver: 3.2mm-high inspector's mark.
·Barrel: the caliber (in mm), in 1.5mm-high numerals.

I would think at least for military they followed this, commercial perhaps not.