Two single weight airmail covers to Germany, franked with singles of the 15c 1970 Christmas Issue, with one on the HF vertical ribbed paper, and the other on the smooth HF paper. The ribbed paper was sent December 12, 1970 while the smooth paper was sent January 5, 1971.
Est $30, as listed in Unitrade at $15 each.
To gain a better understanding of what I consider in valuing covers, you might find it useful to read the blog post here.
