2, 10, 3, 50 Postage Due, Documentar Any Ideas On Cancells?

Hello. Any idea on the cancell marks on these? The 50's look like hand writing. Anything unique? Thanks!

These also...

The documentary stamp has a manuscript cancel, very common for a revenue stamp.

In the first scan, the double-oval is what is often referred to as a "mute" cancel. It was often used for packages and parcels and would have been very common to use for postage due stamps placed on those items.

Also in the first scan, there is a double-oval cancel that reads "New York, NY, Y Station". I believe Station Y was the old reference to the Lenox Hill Station Post Office in New York City.

As mentioned previously, the Documentary Stamps (which were not used as postage) were typically "manuscript cancelled", that is cancelled by means of a pen and ink initial and/or date.

The final scan with a single line cancel is another form of a manuscript cancel. Many post offices precanceled their postage due stamps in that fashion, sometimes before they were even applied to a letter or package that required it. (It saved the postal clerk time in having to both affix the postage due stamp and postmark it afterwards.)

The right stamp in the final scan displays a "box cancel" that was often used on parcels in the early to mid-20th century. They are common and typically have the city and state name imprinted on two lines. Unfortunately, your example is illegible.

Wow! Thank you for the great info! So much to learn! I really appreciate you taking the time to comment.