Next up are a pair of covers that were official issues of the Kalmar Nyckel Commemorative Committee, in conjunction with the Delaware Heritage Commission; the two groups had leading roles in planning and preparing for Delaware's 1988 celebrations of the 350th anniversary of New Sweden.
The cachet on the first cover depicts Queen Christina as she appeared at the time of New Sweden's founding in 1638. The cover was postmarked on March 29, 1988, the first day of issue for the joint-issue of New Sweden commemorative stamps from the US, Sweden and Finland. A primary goal of the Commemorative Committee was to ensure the plan for the three-country joint issue of stamps came to fruition.


The second cover features a cachet depicting the logo of the Commemorative Committee. The logo features the Committee's namesake ship - the
Kalmar Nyckel - which was the lead ship of the two that brought the colony's original settlers. The cover was postmarked on April 13, 1988, the day the Swedish King (Carl XVI Gustaf) and Queen (Silvia) were in Wilmington, DE as part of their cross-country tour of the US.


Each of the covers features the US New Sweden 44-cent airmail stamp. I have not seen covers from the Committee / Commission that include stamps from Sweden or Finland; I believe only covers with the US stamp were issued.
When sold by the Commemorative Committee in 1988, each of the covers included an information card inserted into it. The text on each is identical, only the ink color was changed: brown for the Queen Christina cover and dark blue for the Royal Visit cover. I have included images of both for completeness.
The covers could be purchased at the time for $2.50 each or $4.50 for the pair. As the covers were sold unaddressed, those purchasing them had to enclose a stamped self-addressed envelope with their order and payment (sent to the Commemorative Committee).
Hope you enjoyed the read!