This book was issued by a company for the use of bank employees to assist customers with determining the mortgage payment or loan payment based on knowing how much they needed to borrow and the interest rate and length of the loan or mortgage. There was a day when rates were high and this book shows the lowest rate as 6% for a mortgage and the highest rate is 12%. Southeast National Bank was a bank that rose from the consolidation of National Bank of Chester County and Trust Company in West Chester PA and Delaware County National Bank in Chester. The main office was in West Chester but there was another office in Chester PA. The cover is green. I believe they joined about 1970 but only lasted until they were taken over by another bank less than 10 years later and now would be Wells Fargo Bank. It measures 5 3/4 inches x about 3 1/2 inches. It has 224 numbered pages. We must collect 6% Pennsylvania Sales and Use Tax at checkout. Thanks for stopping by!