Any help would be appreciated. There are only 6 of these large size 1902 $5 plainbacks known, from what I understand, from Scottsville, VA.
It is FR-607 but Nationals are not collected by Friedburg number. Every Elliott-Burke $5.00 plain back regardless of issuing bank has the same FR number.
Filling out the PMG form, it asks for the "catalog number" which is what I assumed the FR # was. Am I wrong? (It says they charge $5 if you don't fill out the catalog number).
Yes. The catalog number means the Friedburg number. The additional charge is if they have to look it up. According to my book on US currency, @letlow is correct. It is FR-607.