I believe originally from a scrap album owned by Robert Goetz, who was related to Countess von Oeynhausennof Friedrickstasse 30 Hamburg
Please see photographs provided which serve as the best possible description, zoom is enabled.
I post all paper items protected and in proper card backed envelopes.
I never add additional folds, if the item is shown with a parcel postage price that is because it is oversized and will not fit in a small or large letter envelope.
I'm always happy to combine postage when I can.
Thanks for looking.