The Blue Book of Gun Values has a listing for model PPK pre-war production, 1931-1940. At the bottom of that section it states you should add 60% to the value for a bottom release magazine in .32 ACP.
It also has a separate listing for a model PPK Lightweight, aluminum version. It says to add 20% to the .32 caliber commercial price listing.
So it appears that you have commercial, pre-war, PPK Lightweight in .32 cal with bottom mag release, so you would add at least 80% to the listed value.
A PPK pre-war .32 caliber, rated 100% condition lists as $725.00.
So according to the book, one with a bottom mag release would be worth $1,160.
And since it's a aluminum alloy frame you could add 20% to that and it would be worth $1,392.00.
Or if you wanted to be conservative and just add 80% to the base price of $725.00, the value would be $1,305.00.
It also has a separate listing for a model PPK Lightweight, aluminum version. It says to add 20% to the .32 caliber commercial price listing.
So it appears that you have commercial, pre-war, PPK Lightweight in .32 cal with bottom mag release, so you would add at least 80% to the listed value.
A PPK pre-war .32 caliber, rated 100% condition lists as $725.00.
So according to the book, one with a bottom mag release would be worth $1,160.
And since it's a aluminum alloy frame you could add 20% to that and it would be worth $1,392.00.
Or if you wanted to be conservative and just add 80% to the base price of $725.00, the value would be $1,305.00.