Washington's And Benjamin's

Hello all.
I would greatly appreciate any information on this black stamp.
looks like a one cent Benjamin but I am new and just acquired a massive collection.
Don't even know wear to start. I have hundreds on assorted color Washington's and Benjamin's .I was wondering if their is a basic check list to go through .to weed out the none valuable items.is the size of a stamp the only way to determine the year printed??

thank you in advance for any help and advice you all can give mee
Cee Cee

Welcome.
A good place to start is here https://stampsmarter.org/1847usa/wa...ankmain.html
or here
https://www.stampsmarter.org/featur...fiersUS.html
Don