Welcome to the forum.

That does sound like a beauty of a 22/32 KG, Model of 1953 New 'I' frame.

Are you sure the Historian told you it was made in 1955, or it shipped in '55? The value sounds right IMO, if it's a round butt, and the serial # on the back of the right grip matches the gun's.

Getting a letter is like buying a lottery ticket; you have a very small chance of finding out much more than the ship date, store/location shipped to and the original configuration, barrel length, etc.. You'll get a little info on the evolution of that model. Most only get the letter when there's a question about some option being an original factory installed item. Some hope that it went to a celebrity or other unique destination. I'd keep the $50 for a more questionable piece, and it takes about 4 months to get the letter.

You can read all about it's evolution by clicking on the yellow 3 above right.

P.S. If you start a new thread next time, you're likely to get more responses.

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Jim
S&WCA #819