Looks to be in good shape, nice plane. It's a classic type 12 plane made 1919-1924. This was the model that introduced the sweetheart era. Notice the sweetheart mark on top of the blade that has New Brittain in the wording. This was the first model that came with the high front knob and large diameter brass blade adjuster. This was the last model to have the smooth face lever cap, all lever caps after this vintage have Stanley cast into the face. Rare versions of this lever cap have the sweetheart logo cast into the back, take a look. $75 is a bit pricey for a #5, $75 is getting up into 605 Bedrock range. It is in good condition and a less common model so it would be worth more than the run-of-the-mill #5.