I can't wait to see who bids on this item:
https://www.ebay.com/itm/127375740223The cover is in extremely good condition, and seems to have a Free franking in red.

But when I look at the insert, something seems rather strange (sorry for the blurry image):

When I asked the seller, they stated that this is an authentic typewritten letter, because that's the way they did it back then. I sent one last followup asking how a letter typewritten in 1834 could have the beautiful right justification style that was perfected by computers in the late 1900's. I'm still waiting for a reply.