I am a little consfused ......

My understanding is that S&W no longer makes 3914/3913 series pistols.

What were the very last variants?

Correct. The 3913/3914 are no longer made. The last variants were the 3913TSW and very scarce 3914TSW.

Great pistols which should still be in production, IMO. Head and shoulders over anything they make now.

Luckily, they made a bunch and the 3913/3914 and TSW variants are still available on the gun auction boards. Regards 18DAI

I believe the model 908 was the last of the series (if you consider it part of the same series). It was essentially a 3914 produced with several cost saving measures. They were available NIB as little as 2 years ago, but I cannot advise if they were recent production or were just in long term storage.