Hello,
Fractional notes are very interesting in our history of paper money...
they were introduced by an Act in 1862 and continued until early 1876.
This all came about do to the shortage of coins during this time as the war between the states was progressing.
They were 5 different issues, the first being postage currency in 4 denominations 5, 10, 25 and 50 cent both in straight edge and perforated. Fractional currency became the common name and were reissued 4 different times adding 3 and 15 cent denominations along the way.
The Lincoln note you have is from the 4th issue and is one of the most popular of all the notes. It is true that all forms of fractional currency were stored and kept with pins on strings, being quite small and easy to lose this was an easy way for store keepers and people alike to keep track of them. The term "pin money" comes from this. Though it is quite common to see the notes with these small pin holes, the notes gain value without them.
The condition of your note would grade "fine", and value would be anywhere from $75-$100. An uncirculated Lincoln brings up to $1000.
Fractional notes are an excellent buy in today's market and are very
much undervalued in comparison to coins.
I am always looking to add to my collection and have been doing so for over 20 years now.
I highly recommend the book by Robert J. Kravitz,
"A Collectors Guide to Postage and Fractional Currency", he is one of the most knowledgeable people on the subject and has the best insight on these fascinating notes.
I hope this helps a little as I can get a bit involved when it comes to this stuff.
Welcome and good luck