Very nice package philb. I have to agree it's always a bonus when the contents are included and they are something special.
And of course, wt1 never fails to impress with his research.
Here's a wedding invitation I found in an envelope with a SC#406 (I believe - perf 12) postmarked Carlisle PA December 15, 1913 (just south of you, I_Love_Stamps, and only a couple of days off your birthday too!), complete with tissue insert and return envelope.


The return envelope is unused, so I assume the Rutherfords did not attend the wedding. But considering it was sent on December 15 and the wedding was on December 30, I'm not surprised.