Based on my data gathering, there are four known 7-Shot Prototypes, two in the 10000B serial range (one being the Georg Luger Pistol in Mr. Shattuck's collection) and two in the 55000B(?) serial range (one of which I have examined), all of them being 'GL' hallmarked. The two in the 55000B serial range have crests on the chambers. It is evident with all the 7-Shot Prototypes that the grip and frame were reduced and welded by DWM. It is interesting to note that a few 'GL' Lugers fall in the 55000B serial range (circa 1906/08) including a cased 1902 Luger carbine presented to President Diaz of Mexico shown in the book 'Luger Holsters' by Eugene Bender.
In regards to the 'true' Baby Lugers, it is reported that five were supposingly made in the circa 1920-1926 and serial #4 which is shown in 'Lugers at Random' has the upper receiver of a caliber .380 and a bottom receiver of .32 ACP. It is believed that the first two were in caliber .32 ACP and the next two in caliber .380. It is assumed that serial #5 was never assembled into a complete pistol and was used for parts which probably explains the incompatible parts on serial #4 as well as the likely evidence of machining. A closer examination of serial #4 is required, however, this has not been possible as a result of 'intercontinental' tensions. I have heard of Mr. Shattuck owning a Baby Luger and I wonder if anybody has examined it or asked him about it?
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