Don't be alarmed. Manufacturers have, over the years, modified the weight of flatware pieces slightly. It seems to us that weights have decreased gradually. In some cases, manufacturers have identified specific weights on pieces but not always (see our post, Gorham Weight Marks).
Generally speaking, weight differences are not all that noticeable. So, it's OK to mix different weights in the same set as far as we are concerned.
One note of caution is worth mentioning. Make sure you are comparing apples to apples. For example, Gorham makes a dinner fork and a place fork in its Buttercup pattern. Both are 7.5 inches long overall but there is quite a bit of difference in weight (see our post, About Forks).
Click on any picture to see a larger version. By clicking on "Comments/Questions" below, you can see posted comments and add your own questions and comments. Or, you can send us an email by clicking on "Email Silver Jim" in the right column.