Congrats on your new gat!
I've got the identical gun, bought 'as new' the same time I bought a new '71 in .38, both with 7-1/2" barrels. Mine came with a mainspring that was so light it wouldn't pop primers. Hope to have a coupla new ones in the mail by tomorrow.
Odd how much I like these guns as in the past, you couldn't have interested me in a .38 SAA. My first '71 was also in .38 with 5-1/2" barrel, purchased for my wife, who doesn't like it. It's the only one I've fired with BP so far, and that was a blast!