There's a great You Tube channel called Forgotten Weapons available for the Investigator with an eye on 'personal protection'.
While it must be noted that many of the interesting ones were custom or rare, I couldn't help thinking that the ... er ... "well heeled" Investigator might consider the Lancaster Howdah pistols (dated from Victorian times for the military and big game hunter) to the U.S. Auto Bandits which available from the 20's up to the early '40s were, in effect, shop-bought sawn-off shotguns!
Keepers should always limit because of their rarity and state and country legi