The PPK is the "Bond" gun and a hot item since the first Bond movie in 1962/63...... "Dr No".
I carried a Interarms stainless PPK .380 as my "suit gun"; holstered in a Milt Sparks summer special, from about 1984 until I got my first S&W 3913...... (think ASP) in 1989.
Still have that PPK, and it goes to every Bond movie premier........
.....another.380 in blue and a PPK/s in .32apc.
As to value I got the PPK/s about 3 years ago with 4 magazines for about $300 out the door...... cus it was a .32and a PPK/s!