frame sizes

Elmosdad

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N G Mountains
Will someone tell me the order of frame sizes, I know J is the smallest
just don't know whats next.....
 
Of current models, the J is smallest, followed by the K, L, N and finally the X. Just about all the letters have been used starting in the late 1800s.
 
I = very small (obsolete by 1960)
J = small (started in 1950)
K = medium
L = medium (same size grip as K, but larger/heavier frame)
N = Large
X = Xtra Large (Mdls 460 and 500)
Z = the Governor

If you go to S&W's web page for revolvers Revolvers | Smith & Wesson there is a pull-down on the far right side for frame size, and you can use that to see what models (by number) fall into which category.
 
Was the N frame originally an S Frame?

No, you are confusing serial numbering with the frame size. After WWII, the N frames were serialized with a serial starting with an "S". Around 1969 they changed the serial numbers to start with an "N" instead of the "S" and they continued that with the N frames until they changed over to their present serial numbering scheme of 3 letters and 4 numbers.
 
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