A group of 2 single weight airmail covers and one double weight surface cover to Germany all franked with various combinations of the 1967 commemoratives and 1968 Grey Jays issue, paying either the double surface rate, or the single airmail rate. The double surface cover is particularly unusual and attractive, as that rate is not often seen.
Est $20.
To gain a better understanding of what I consider in valuing covers, you might find it useful to read the blog post here.
