Keewatin, Minnesota. $5 1902 Plain Back. Fr. 606. The First NB. Charter #10903. Choice About Uncirculated.An offering which is highly important as this 1902 $5 Plain Back becomes just the sixth known on this Itasca County charter. A previous five known large size consisted of two $5 1902 plain backs, and three $10s. The last to sell, a PMG 63EPQ sold for $7200 in an auction earlier this year. Superb margins add appeal to the design along with bold manuscript signatures.