Which 3900 series come closest in profile to the 3953/3954?
Need a mold (Blue Gun, etc.) for making a holster.
Can’t find 3953/3954 mold.

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and what his trumpet saith

The 3913/3914 are the DA/SA version of the 3953. The 3913/3914 Lady Smith or 3913 NL (N Logo) have a slightly different frame in front of the trigger guard in the dust cover area but my 3913 NL fit in every 3913 holster I tried.

Thank you very much.

__________________
and what his trumpet saith

I hope this helps...

The bag a holster for my S&W Model 3953 from Don Hume reads that it will fit: S&W 3913 LS, 3953, 6904, 6906, Round Trigger Guard.

Note: I had to bone the bulge created by the safety lever from the holster but that was easy and it disappeared after a month of wearing.

Watchdog Tactical in Charlotte, NC molded a 39XX AIWB holster for me a few months ago. They used my 3953 as the mold. It works with all of my 39XX pistols. In fact, carried a 3914 DAO in it today.

If you are incorporating a thumb break into your holster design, just be aware that the 3953 slide is longer than that of the standard 3913.