This receipt for a Hammond 1 purchased on August 16th, 1888 appears to have gotten a little wet, but thanks to technology we can zoom in and make out its serial number.
Whenever I come across a serial number I compare it to my database of serials and current owners. For the first time I found a receipt whose serial number was in my database, and had a current owner listed.
A desire among many collectors of antique typewriters is to have the machine with its original receipt, and a photo of its original owner using the machine.
Alas, when I checked I found that the person had sold their Hammond 1 and now a receipt is once again without its machine.
Incidentally, this Hammond 1 was sold for $100 which, adjusted for inflation, is about $3,149 in 2023.