Just wanted to share a treasure I found in an auction and add to the forum. It has no known sender so it is hard to say if the person was a stamp collector but the thought of the travel course it made is quite interesting. There are two notable shifts as well in SC294 & SC298.
ritm, Welcome! Your cover started as a fairly plain 2 cent cover mailed from Boston to Holyoke. In modern times the other 4 stamps, the Staten Island 4-bar postmarks, and the auxiliary mark over the address were added. I have a vague recollection of a similar cover appearing in a previous thread several years ago.