That is a very interesting handgun. Congratulations on scoring it.
With its .357 Magnum caliber, your Coonan would pair up well with an IMI Timberwolf carbine also chambered for .357. I see a Timberwolf show up every now and then on Gunbroker, and a few of them have been NIB. I have a Timberwolf. I may now want to give a Coonan a close look.
The .357 Mag. is one versatile cartridge -- revolver, semi-automatic pistol, pump carbine . . . .