kpallan
First - welcome to the Forum!
A .357 Magnum from 1952 is a wonderful gun to own, and the fact that it has been in the family since it was new makes it priceless to you.
Whoever gave you the information you cited in your original post had most things right. On the stocks, however, he may be off a bit.
I'm not sure when N frame target stocks became available, but I know that my .357 Magnum that letters to May, 1952 came with Magna stocks and I rather think N targets came along after that - someone else here will know for sure. I'm pretty sure that targets were available for the K frame before they were offered on the N frame revolvers.

Moreover, it was uncommon for target stocks to be numbered to the gun. Magnas certainly were during the early 1950s.

Also, I am also quite sure the "coke" stocks were not yet available in 1952.

In any case, this all may be moot, depending on what stocks are actually on your gun. I don't think your post told us what they were. I'm guessing they are of the Magna style.

I hope that this information is helpful to you.

If anything I've written is inaccurate, I'm sure someone here will correct me.

Jack

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Jack
SWCA #2475, SWHF #318