Is this a Vintage Rolex Oyster Perpetual DateJust Watch?

[vintage2122]

Hi!
I'm not that familiar with Vintage Rolex Watches, but I was given one and I wanted to what you think about this Vintage Rolex Oyster Perpetual DateJust Watch and some information on what year it could be from. I collect Vintage Watches and this is my first Rolex Watch. I did a good amount of research about Vintage Rolex Watches. There is no stamp on the back. There is a crown stamp on the clasp. Also inside the clasp it is stamped Stainless Steel Hong Kong. The watch ticks really good. You can tell that there is gold because its tarnishing brownish. I can definitely tell its vintage by the tarnishing. The date bubble has some scratches on it making the date a little blurry. The watch weighs 38 grams according to my scale. I think its a Vintage Rolex Oyster Perpetual DateJust Watch from anywhere between 50s-80s. Just wanted to see what you guys think. I have never posted on this Forum before because this is the first time I have received a Rolex Watch before.