As well as the excellent photos in the Guide to Grading book, there is a really useful list of descriptions on page 5 where it gives estimates of years that a coin will have been in circulation to be a particular grade. For example, an EF coin will, on average, have been in circulation for about 1 year whereas a Fine coin could have been around for 30 years or so. Your coin would seem to fit the 5 years of circulation that describes VF . By picking coins out of your change, you should be able to get a good feel for wear as there will be decimal coins in your pocket up to 45 years old, and there should be a good range from F to Aunc.