how much should I pay for a p99 in 9mm if it was made and imported to the usa?
Just want to clarify what you mean by this? Smith and Wesson never made anything stamped P99, they just imported them (Walther made P99's) and provided customer support. Smith and Wesson was stamped on those slides in relative miniscule fashion, per firearm import laws. The joint Walther/S&W collaboration product say SW99 on them (at least every one I have seen).The ~5000 guns Walther had them make for them say P99 on them, not SW99.
Interarms also "made" the PPK and PPK/S here in the U.S. by contracting Ranger Manufacturing in Alabama.Yes, every single one has the ulm proofmark. S&W MADE the PPK. Interarms imported it.